SX1501I087TRT

SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO with NINT and NRESET GENERAL DESCRIPTION KEY PRODUCT FEATURES The SX1501, SX1502 and SX1503 are complete ultra low voltage General Purpose parallel Input/Output (GPIO) expanders ideal for low power handheld battery powered equipment. They allow easy serial 2 expansion of I/O through a standard I C interface. GPIO devices can provide additional control and monitoring when the microcontroller or chipset has insufficient I/O ports, or in systems where serial communication and control from a remote location is advantageous. • • • • • • These devices can also act as a level shifter to connect a microcontroller running at one voltage level to a component running at a different voltage level. The core is operating as low as 1.2V while the I/O banks can operate between 1.2V and 5.5V independent of the core voltage and each other. • • • • Each GPIO is programmable via 8-bit configuration registers. Data registers, direction registers, pullup/pull-down registers, interrupt mask registers and interrupt registers allow the system master to program and configure 4 or 8 or 16-GPIOs using a 2 standard 400kHz I C interface. • The SX1501, SX1502 and SX1503 offer a unique fully programmable logic functions like a PLD to give more flexibility and reduce external logic gates used for standard applications. 4/8/16 channel of I/Os
True bi-directional style I/O
Programmable Pull-up/Pull-down
Push/Pull outputs 1.2V to 5.5V independent operating voltage for all supply rails (VDDM, VCC1, VCC2) 5.5V compatible I/Os, up to 24mA output sink (no total sink current limit) Fully programmable logic functions (PLD) 2 400kHz 2-wire I C compatible slave interface Open drain active low interrupt output (NINT)
Bit maskable
Programmable edge sensitivity Power-On Reset and reset input (NRESET) Ultra low current consumption of typ. 1uA -40°C to +85°C operating temperature range Ultra-Thin 3x3mm QFN-UT-20 and TSSOP-20 packages (SX1501/SX1502) Ultra-Thin 4x4mm QFN-UT-28 and TSSOP-28 packages (SX1503) TYPICAL APPLICATIONS • • • • • • • The SX1501, SX1502 and SX1503 have the ability to generate mask-programmable interrupts based on falling/rising edge of any of its GPIO lines. A dedicated pin indicates to a host controller that a state change occurred in one or more of the GPIO lines. Cell phones, PDAs, MP3 players Digital camera Portable multimedia player Notebooks GPS Units Industrial, ATE Any battery powered equipment The SX1501, SX1502 and SX1503 each come in a small QFN-UT-20/28 package as well as a TSSOP20/28 package. All devices are rated from -40°C to +85°C temperature range. ORDERING INFORMATION Part Number SX1501I087TRT SX1502I087TRT SX1503I091TRT (1) SX1501I088TRT (1) SX1502I088TRT (1) SX1503I089TRT (2) SX1502EVK (1) (2) I/O Channels 4 8 16 4 8 16 8 Package QFN-UT-20 QFN-UT-20 QFN-UT-28 TSSOP-20 TSSOP-20 TSSOP-28 Evaluation Kit Future products SX1502I087TRT based, unique evaluation kit for the three parts. nd Rev 7 – 2 Oct. 2008 www.semtech.com 1 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Table of Contents GENERAL DESCRIPTION ..................................................................................................................... 1 ORDERING INFORMATION................................................................................................................... 1 KEY PRODUCT FEATURES.................................................................................................................. 1 TYPICAL APPLICATIONS ..................................................................................................................... 1 1 PIN DESCRIPTION ...................................................................................................................... 4 1.1 1.2 1.3 2 SX1501 4-channel GPIO SX1502 8-channel GPIO SX1503 16-channel GPIO 4 5 6 ELECTRICAL CHARACTERISTICS ............................................................................................... 7 2.1 2.2 3 Absolute Maximum Ratings Electrical Specifications 2.2.1 Increasing I/O Sink and Source Current Capabilities (Boost Mode) 7 7 9 TYPICAL OPERATING CHARACTERISTICS ............................................................................... 10 3.1 3.2 3.3 3.4 4 IDDM vs. VDDM VOL vs. IOL VOH vs. IOH ICC1+ICC2 vs. VCC1,2 when Boost Mode is ON 10 10 11 12 BLOCK DETAILED DESCRIPTION ............................................................................................. 13 4.1 4.2 4.3 4.4 4.5 SX1501 4-channel GPIO SX1502 8-channel GPIO SX1503 16-channel GPIO Reset (NRESET) 2 2-Wire Interface (I C) 4.5.1 WRITE 4.5.2 READ 4.5.3 READ - STOP separated format (SX1501 and SX1502 only) 4.6 Interrupt (NINT) 4.7 Programmable Logic Functions (PLD) 4.7.1 SX1501 4.7.2 SX1502 4.7.3 SX1503 4.7.4 Tutorial 5 13 13 14 14 15 15 16 16 17 17 17 18 18 19 CONFIGURATION REGISTERS .................................................................................................. 20 5.1 5.2 5.3 6 SX1501 4-channel GPIO SX1502 8-channel GPIO SX1503 16-channel GPIO 20 21 23 APPLICATION INFORMATION ................................................................................................... 27 6.1 6.2 Typical Application Circuit Typical LED Operation 6.2.1 LED ON/OFF Control 6.2.2 LED Intensity Control 6.3 Keypad Implementation 27 27 27 28 28 nd Rev 7 – 2 Oct. 2008 www.semtech.com 2 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 6.4 7 Level Shifter Implementation Hints PACKAGING INFORMATION ..................................................................................................... 29 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 8 28 QFN-UT 20-pin Outline Drawing QFN-UT 20-pin Land Pattern QFN-UT 28-pin Outline Drawing QFN-UT 28-pin Land Pattern TSSOP 20-pin Outline Drawing TSSOP 20-pin Land Pattern TSSOP 28-pin Outline Drawing TSSOP 28-pin Land Pattern 29 29 30 30 31 31 32 32 SOLDERING PROFILE .............................................................................................................. 33 nd Rev 7 – 2 Oct. 2008 www.semtech.com 3 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 1 1.1 PIN DESCRIPTION SX1501 4-channel GPIO Pin Symbol Type 1 2 3 4 5 6 7 8 NRESET SDA NC1 SCL I/O[0] I/O[1] VCC1 GND DIO DIO DI DIO (*1) DIO (*1) P P 9 I/O[2] DIO (*1) 10 I/O[3] DIO (*1) 11 12 13 14 15 16 17 18 19 20 NINT ADDR NC2 VDDM NC3 NC4 NC7 GND NC5 NC6 DO DI P P - Description Active low reset I2C serial data line Leave open, not connected I2C serial clock line I/O[0], at power-on configured as an input I/O[1], at power-on configured as an input I/O supply voltage Ground Pin I/O[2], at power-on configured as an input High sink I/O. I/O[3], at power-on configured as an input High sink I/O. Active low interrupt output Address input, connect to VDDM or GND Leave open, not connected Main supply voltage Leave open, not connected Leave open, not connected Connect to VCC1 Ground Pin Leave open, not connected Leave open, not connected A: Analog D: Digital I: Input O: Output P: Power (*1) This pin is programmable through the I2C interface NC4 NC7 GND NC5 NC6 Table 1 – SX1501 Pin Description NRESET NC3 SDA VDDM NC1 NC2 SCL ADDR GND (PAD) I/O[3] I/O[2] GND VCC1 NINT I/O[1] I/O[0] Figure 1 – SX1501 QFN-UT-20 Pinout nd Rev 7 – 2 Oct. 2008 www.semtech.com 4 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 1.2 SX1502 8-channel GPIO Pin Symbol Type 1 2 3 4 5 6 7 8 NRESET SDA NC1 SCL I/O[0] I/O[1] VCC1 GND DIO DIO DI DIO (*1) DIO (*1) P P 9 I/O[2] DIO (*1) 10 I/O[3] DIO (*1) 11 12 13 14 15 16 17 18 19 20 NINT ADDR NC2 VDDM I/O[4] I/O[5] VCC2 GND I/O[6] I/O[7] DO DI P DIO (*1) DIO (*1) P P DIO (*1) DIO (*1) Description Active low reset I2C serial data line Leave open, not connected I2C serial clock line I/O[0], at power-on configured as an input I/O[1], at power-on configured as an input Supply voltage for Bank A I/O[0-3] Ground Pin I/O[2], at power-on configured as an input High sink I/O. I/O[3], at power-on configured as an input High sink I/O. Active low interrupt output Address input, connect to VDDM or GND Leave open, not connected Main supply voltage I/O[4], at power-on configured as an input I/O[5], at power-on configured as an input Supply voltage for Bank B I/O[4-7] Ground Pin I/O[6], at power-on configured as an input I/O[7], at power-on configured as an input A: Analog D: Digital I: Input O: Output P: Power (*1) This pin is programmable through the I2C interface I/O[5] VCC2 GND I/O[6] I/O[7] Table 2 – SX1502 Pin Description NRESET I/O[4] SDA VDDM NC1 NC2 SCL ADDR GND (PAD) I/O[3] I/O[2] GND VCC1 NINT I/O[1] I/O[0] Figure 2 – SX1502 QFN-UT-20 Pinout nd Rev 7 – 2 Oct. 2008 www.semtech.com 5 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 1.3 SX1503 16-channel GPIO Pin Symbol Type Description 1 2 3 4 5 6 7 GND I/O[2] I/O[3] VCC1 I/O[4] I/O[5] GND P DIO (*1) DIO (*1) P DIO (*1) DIO (*1) P 8 I/O[6] DIO (*1) 9 I/O[7] DIO (*1) 10 11 12 13 14 15 16 17 18 19 20 21 NINT NC VDDM I/O[8] I/O[9] GND I/O[10] I/O[11] VCC2 I/O[12] I/O[13] GND DO P DIO (*1) DIO (*1) P DIO (*1) DIO (*1) P DIO (*1) DIO (*1) P 22 I/O[14] DIO (*1) 23 I/O[15] DIO (*1) 24 25 26 27 28 NRESET SDA SCL I/O[0] I/O[1] DIO DIO DI DIO (*1) DIO (*1) Ground Pin I/O[2], at power-on configured as an input I/O[3], at power-on configured as an input I/O supply voltage for Bank A I/O[0-7] I/O[4], at power-on configured as an input I/O[5], at power-on configured as an input Ground Pin I/O[6], at power-on configured as an input High sink I/O. I/O[7], at power-on configured as an input High sink I/O. Active low interrupt output Leave open, not connected Main supply voltage I/O[8], at power-on configured as an input I/O[9], at power-on configured as an input Ground Pin I/O[10], at power-on configured as an input I/O[11], at power-on configured as an input I/O supply voltage for Bank B I/O[8-15] I/O[12], at power-on configured as an input I/O[13], at power-on configured as an input Ground Pin I/O[14], at power-on configured as an input High sink I/O. I/O[15], at power-on configured as an input High sink I/O. Active low reset I2C serial data line I2C serial clock line I/O[0], at power-on configured as an input I/O[1], at power-on configured as an input A: Analog D: Digital I: Input O: Output P: Power (*1) This pin is programmable through the I2C interface 22 I/O[14] 23 I/O[15] 24 NRESET 25 SDA 26 SCL 27 I/O[0] 28 I/O[1] Table 3 – SX1503 Pin Description I/O[12] GND (PAD) 18 VCC2 I/O[4] 5 17 I/O[11] I/O[5] 6 16 I/O[10] GND 7 15 GND 8 9 10 I/O[6] I/O[7] NINT VCC1 4 14 19 I/O[9] TOP VIEW I/O[3] 3 13 I/O[13] I/O[8] 20 12 I/O[2] 2 VDDM GND 11 21 NC GND 1 Figure 3 – SX1503 QFN-UT-28 Pinout nd Rev 7 – 2 Oct. 2008 www.semtech.com 6 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 2 ELECTRICAL CHARACTERISTICS 2.1 Absolute Maximum Ratings Stress above the limits listed in the following table may cause permanent failure. Exposure to absolute ratings for extended time periods may affect device reliability. The limiting values are in accordance with the Absolute Maximum Rating System (IEC 134). All voltages are referenced to ground (GND). Symbol VDDMmax VCC1,2max VESD_HBM VESD_CDM VESD_MM TA TC TSTG Ilat Description Main supply voltage I/O banks supply voltage (1) Electrostatic handling HBM model Electrostatic handling CDM model Electrostatic handling MM model Operating Ambient Temperature Range Junction Temperature Range Storage Temperature Range (2) Latchup-free input pin current Min - 0.4 - 0.4 -40 -40 -55 +/-100 Max 6.0 6.0 1500 300 200 +85 +125 +150 - Unit V V V V V °C °C °C mA (1) Tested according to JESD22-A114A (2) Static latch-up values are valid at maximum temperature according to JEDEC 78 specification Table 4 - Absolute Maximum Ratings 2.2 Electrical Specifications Table below applies to default registers values (Boost Mode Off), unless otherwise specified. Typical values are given for TA = +25°C, VDDM=VCC1=VCC2=3.3V. Symbol Supply VDDM VCC1,2 IDDM ICC1,2 Description Conditions Min Typ Max Unit - 1.2 1.2 - 5.5 5.5 V V - - 1 5 µA VCC1,2 >= 2V VCC1,2 < 2V - 1 0.5 2 1 µA Main supply voltage I/O banks supply voltage Main supply current 2 (I C inactive) (1) I/O banks supply current I/Os set as Input VIH High level input voltage - 0.7* VCC1,2 - VIL Low level input voltage - -0.4 - VHYS Hysteresis of Schmitt trigger - - 0.1* VCC1,2 - V ILEAK Input leakage current -1.5 - 1.5 µA - - 10 pF - VCC1,2 V - 0.3 8 (2) 0.3 24 (2) 6 12 6 1.5 V CI Input capacitance I/Os set as Output VOH Assuming no active pull-up/down - High level output voltage VOL Low level output voltage High level output source IOH current Low level output sink current for the high sink I/Os IOL Low level output sink current for the other I/Os. tPV Output data valid timing NINT (Output) VOL Low level output voltage IOLM Low level output sink current tIV Interrupt valid timing VCC1,2 >= 2V VCC1,2 < 2V VCC1,2 >= 2V VCC1,2 < 2V VCC1,2 >= 2V VCC1,2 < 2V Cf. Figure 9 VDDM >= 2V VDDM < 2V From input data change nd Rev 7 – 2 Oct. 2008 VCC1,2 – 0.3 -0.4 - - VCC1,2 +0.3 0.3* VCC1,2 0.3 12 6 1 V V mA mA mA µs V mA µs www.semtech.com 7 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Symbol Description tIR Interrupt reset timing NRESET (Input/Output) VOL Low level output voltage Conditions From RegInterruptSource clearing Min Typ Max Unit - - 2 µs VDDM >= 2V VDDM < 2V 0.7* VDDM - 0.3 12 6 V - 5.5 V - 0.3* VDDM V - V IOLM Low level output sink current VIHMR High level input voltage - VILM Low level input voltage - -0.4 Hysteresis of Schmitt trigger - - Cf. Figure 7 Cf. Figure 7 Cf. Figure 7 Cf. Figure 7 Cf. Figure 7 -1.5 0.7 0.6 300 VHYSM ILEAK Input leakage current CI Input capacitance VPOR Power-On-Reset voltage VDROPH High brown-out voltage VDROPL Low brown-out voltage tRESET Reset time tPULSE Reset pulse from host uC ADDR (Input) 0.1* VDDM VDDM-1 0.2 - VIHMA High level input voltage - 0.7* VDDM - VILM Low level input voltage - -0.4 - Hysteresis of Schmitt trigger - - VHYSM 1.5 10 0.9 7 VDDM +0.3 0.3* VDDM 0.1* VDDM - - mA µA pF V V V ms ns V V V ILEAK Input leakage current -1.5 1.5 µA CI Input capacitance 10 pF (3) SCL (Input) and SDA (Input/Output) 2 2 Interface complies with slave F/S mode I C interface as described by Philips I C specification version 2.1 2 dated January, 2000. Please refer to that document for more detailed I C specifications. VOL Low level output voltage IOLM Low level output sink current VIHMR High level input voltage - VILM Low level input voltage fSCL tLOW SCL clock frequency Hold time (repeated) START condition LOW period of the SCL clock tHIGH HIGH period of the SCL clock tHD;STA VDDM >= 2V VDDM < 2V tHD;DAT tSU;DAT tr - 0.3 12 6 - 5.5 - -0.4 - - 0 - V mA V - 0.3* VDDM 400 kHz 0.6 - - µs VDDM >= 1.3V VDDM < 1.3V 1.3 0.6 1 - - µs - 0.6 - - - (4) Set-up time for a repeated START condition Data hold time Data set-up time Rise time of both SDA and SCL signals tSU;STA 0.7* VDDM - nd Rev 7 – 2 Oct. 2008 0 (6) 100 (7) 20+0.1Cb V µs µs (5) - 0.9 - µs - 300 ns www.semtech.com 8 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Symbol Description Fall time of both SDA and tf SCL signals Set-up time for STOP tSU;STO condition Bus free time between a tBUF STOP and START condition Capacitive load for each bus Cb line Noise margin at the LOW VnL level for each connected device (including hysteresis) Noise margin at the HIGH VnH level for each connected device (including hysteresis) Miscellaneous Programmable pull-up/down RPULL resistors for IO[0-7] tPLD PLD propagation delay Conditions Min Typ Max Unit - (7) 20+0.1Cb - 300 ns - 0.6 - - µs - 1.3 - - µs - - - 400 pF - 0.1*VDDM - - V - 0.2*VDDM - - V - - 60 - kΩ VCC1,2 & VDDM = 5V VCC1,2 & VDDM = 1.2V - - 25 125 ns (1) Assuming no load connected to outputs and inputs fixed to VCC1,2 or GND. (2) Can be increased in RegAdvanced register. Please refer to §2.2.1 for more details. (3) All values referred to VIHMR min and VILM max levels. (4) A device must internally provide a hold time of at least 300ns for the SDA signal (referred to VIHMR min) to bridge the undefined region of the falling edge of SCL. (5) The maximum tHD;DAT has only to be met if the device does not stretch the LOW period (tLOW ) of the SCL signal. (6) A Fast-mode I2C-bus device can be used in a Standard-mode I2C-bus system, but the requirement tSU;DAT ≥ 250 ns must then be met. This will automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line tr max+ tSU;DAT = 1000 + 250 = 1250 ns (according to the Standard-mode I2C-bus specification) before the SCL line is released. (7) Cb = total capacitance of one bus line in pF. If mixed with Hs-mode devices, faster fall-times are allowed. Table 5 – Electrical Specifications 2.2.1 Increasing I/O Sink and Source Current Capabilities (Boost Mode) When bit 1 of RegAdvanced register is set, max IOH and IOL spec when VCC1,2 is below VBOOST can be increased together with IDDM and ICC1,2 figures as described below. Symbol Description Conditions Min Typ Max Unit Supply VBOOST Low voltage boost threshold 2.0 2.2 2.4 V Main supply current VDDM = 5.5V (VCC1,2 < VBOOST) 150 250 µA IDDM 2 (I C inactive) VDDM = 1.2V (VCC1,2 < VBOOST) 25 50 uA VCC1 = VBOOST 250 350 ICC1 I/O bank A supply current µA VCC1 = 1.2V 100 200 VCC2 = VBOOST 150 250 SX1502 VCC2 = 1.2V 50 150 ICC2 I/O bank B supply current µA VCC2 = VBOOST 250 450 SX1503 VCC2 = 1.2V 100 200 I/Os set as Output VCC1,2 >= VBOOST 8 High level output source IOH mA current for all I/Os VCC1,2 < VBOOST 4 VCC1,2 >= VBOOST 24 Low level output sink current mA for the high sink I/Os VCC1,2 < VBOOST 12 IOL Low level output sink current VCC1,2 >= VBOOST 12 mA for the other I/Os VCC1,2 < VBOOST 6 NINT, NRESET Low level output sink current VDDM >= VBOOST 12 IOLM mA for NINT, NRESET VDDM < VBOOST 6 Table 6 – Electrical Specifications in Boost Mode Important: RegAdvanced register doesn’t affect any spec when VCC1 and VCC2 are above VBOOST. nd Rev 7 – 2 Oct. 2008 www.semtech.com 9 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 3 TYPICAL OPERATING CHARACTERISTICS Figures below apply to default registers values (Boost Mode Off), Tamb, unless otherwise specified. 3.1 IDDM vs. VDDM IDDM vs VDDM 3.5 3 2.5 IDDM (uA)2 90°C -40°C 1.5 1 0.5 0 0 1 2 3 4 5 6 VDDM (V) 3.2 VOL vs. IOL VOL vs IOL (VCC1,2=1.2V, all IOs) 0.15 0.1 VOL (V) * Tamb 0.05 0 0 * 1.5 Doesn’t vary significantly with temperature 3 4.5 6 7.5 9 IOL (mA) nd Rev 7 – 2 Oct. 2008 www.semtech.com 10 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING VOL vs IOL (VCC1,2=5.5V, High Sink IOs) 0.15 0.1 VOL (V) * Tamb 0.05 0 0 * 3.3 5 10 15 20 25 30 IOL (mA) Doesn’t vary significantly with temperature VOH vs. IOH VOH vs IOH (VCC1,2=1.2V) 1.2 1.18 1.16 VOH (V) Tamb 1.14 * 1.12 1.1 0 * 0.2 0.4 Doesn’t vary significantly with temperature 0.6 0.8 1 IOH (mA) VOH vs IOH (VCC1,2=5.5V) 5.5 5.4 5.3 VOH (V) Tamb * 5.2 5.1 5 0 * Doesn’t vary significantly with temperature 10 20 IOH (mA) nd Rev 7 – 2 Oct. 2008 www.semtech.com 11 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 3.4 ICC1+ICC2 vs. VCC1,2 when Boost Mode is ON ICC1+ICC2 vs VCC1,2 (VDDM = 1.2V) 700 600 500 Tamb 400 ICC (uA) Boost Mode ON 300 -40°C 90°C 200 100 0 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 VCC1,2 (V) ICC1+ICC2 vs VCC1,2 (VDDM = 5.5V) 500 400 Tamb ICC (uA) Boost Mode ON 300 -40°C 200 90°C 100 0 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 VCC1,2 (V) nd Rev 7 – 2 Oct. 2008 www.semtech.com 12 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 4 4.1 BLOCK DETAILED DESCRIPTION SX1501 4-channel GPIO VDDM Reset NRESET 2 I C Bus Control SCL SDA 4-Bit R/W I/O Bank A A Input VCC1 I/O[0] I/O[1] I/O[2] I/O[3] Filter Interrupt NINT I/O Bank A VCC1 I/O[0] I/O[1] I/O[2] I/O[3] ADDR SX1501 GND Figure 4 – 4-channel Low Voltage GPIO 4.2 SX1502 8-channel GPIO VDDM Reset NRESET SCL SDA A 2 I C Bus 8-Bit Control R/W Input I/O Bank B Filter A VCC2 I/O[4] I/O[5] I/O[6] I/O[7] ADDR SX1502 Interrupt NINT GND Figure 5 – 8-channel Low Voltage GPIO nd Rev 7 – 2 Oct. 2008 www.semtech.com 13 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 4.3 SX1503 16-channel GPIO VCC1 I/O[0] I/O[1] I/O[2] I/O[3] I/O[4] I/O[5] I/O[6] I/O[7] I/O Bank A VDDM A 8-Bit Reset R/W NRESET 2 I C Bus Control SCL SDA Input 8-Bit Filter R/W VCC2 I/O[8] I/O[9] I/O[10] I/O[11] I/O[12] I/O[13] I/O[14] I/O[15] I/O Bank B A SX1503 NINT Interrupt GND Figure 6 – 16-channel Low Voltage GPIO 4.4 Reset (NRESET) The SX1501, SX1502 and SX1503 generate their own power on reset signal after a power supply is connected to the VDDM pin. The reset signal is made available for the user at the pin NRESET. The rising edge of the NRESET indicates that the startup sequence of the SX1501, SX1502 or SX1503 has finished. NRESET must be connected to VDDM (or greater) either directly, or via a resistor. 1 2 3 4 5 6 2 1 VDROPH VPOR VDROPL VDDM Undefined Undefined Undefined NRESET tRESET tPULSE tRESET Figure 7 – Power-On / Brown-out Reset Conditions 1. Device behavior is undefined until VDDM rises above VPOR, at which point NRESET is driven to GND by the SX1501, SX1502 or SX1503. 2. After tRESET, NRESET is released (high-impedance) by the SX1501, SX1502 or SX1503 to allow it to be pulled high by an external resistor. nd Rev 7 – 2 Oct. 2008 www.semtech.com 14 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 3. In operation, the SX1501, SX1502 and SX1503 may be reset at anytime by an external device driving NRESET low during tPULSE. Chip can be accessed normally again after NRESET rising edge. 4. During a brown-out event, if VDDM drops above VDROPH a reset will not occur. 5. During a brown-out event, if VDDM drops between VDROPH and VDROPL a reset may occur. 6. During a brown-out event, if VDDM drops below VDROPL a reset will occur next time VPOR is crossed. Please note that a brown-out event is defined as a transient event on VDDM. If VDDM is attached to a battery, then the gradual decay of the battery voltage will not be interpreted as a brown-out event. Please also note that a sharp rise in VDDM (> 1V/us) may induce a circuit reset. 2 4.5 2-Wire Interface (I C) 2 The SX1501, SX1502 and SX1503 2-wire interface (I C compliant) operates only in slave mode. In this configuration, the device has one or two device addresses defined by ADDR pin. Device SX1501 & SX1502 SX1503 ADDR Pin 0 1 2 I C Address Description First address of the 2-wire interface 0x20 (0100000) Second address of the 2-wire interface 0x21 (0100001) 0x20 (0100000) Fixed address of the 2-wire interface Table 7 - 2-Wire Interface Address 2 lines are used to exchange data between an external master host and the slave device: • SCL : Serial CLock • SDA : Serial DAta 2 2 The SX1501, SX1502 and SX1503 are read-write slave-mode I C devices and comply with the Philips I C standard Version 2.1 dated January, 2000. The SX1501, SX1502 and SX1503 have respectively 12, 16, and 31 2 user-accessible internal 8-bit registers. The I C interface has been designed for program flexibility, in that once the slave address has been sent to the SX1501, SX1502 or SX1503 enabling it to be a slave transmitter/receiver, any register can be written or read independently of each other. While there is no auto 2 increment/decrement capability in the SX1501 and SX1502 I C logic, a tight software loop can be designed to access the next register independent of which register you begin accessing. SX1503 implements auto increment capability. The start and stop commands frame the data-packet and the repeat start condition is allowed if necessary. Seven bit addressing is used and ten bit addressing is not allowed. Any general call address will be ignored by the SX1501, SX1502 and SX1503. The SX1501, SX1502 and SX1503 are not CBUS compatible and can operate in standard mode (100kbit/s) or fast mode (400kbit/s). 4.5.1 WRITE 2 The simplest format for an I C write is given below. After the start condition [S], the slave address is sent, 2 followed by an eighth bit indicating a write. The I C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the appropriate 8 bit data byte. Once again the slave acknowledges and the master terminates the transfer with the stop condition [P]. Master operations SX1501, SX1502 or SX1503 operations (Slave) S: Start Condition W: Write = ‘0’ A: Acknowledge (sent by slave) P: Stop condition Slave Address: 7 bit Register Address: 8 bit Data: 8 bit Figure 8 - 2-Wire Serial Interface, Write Register Operation nd Rev 7 – 2 Oct. 2008 www.semtech.com 15 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Figure 9 – Write RegData Register Please note that SX1503 implements register address auto-increment i.e. after the Data ACK from Slave the master can write further bytes and the interface will handle the register address increment automatically. Finally the master terminates the transfer normally the stop condition [P]. 4.5.2 READ 2 After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The I C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the repeated start condition [Sr]. Once again, the slave address is sent, followed by an eighth bit indicating a read. The slave responds with an acknowledge and the previously addressed 8 bit data byte; the master then sends a non-acknowledge (NACK). Finally, the master terminates the transfer with the stop condition [P]. Master operations SX1501, SX1502 or SX1503 operations (Slave) S: Start Condition W: Write = ‘0’ R: Read = ‘1’ A: Acknowledge (sent by slave) NACK: Non-Acknowledge (sent by master) Sr: Repeated Start Condition P: Stop condition Slave Address: 7 bit Register Address: 8 bit Data: 8 bit Figure 10 - 2-Wire Serial Interface, Read Register Operation Please note that SX1503 implements register address auto-increment i.e. after the Data byte from Slave the master can acknowledge (ACK) to indicate that it wants to read the next byte and the interface will handle the register address increment automatically. Finally the master terminates the transfer normally with a NACK followed by the stop condition [P]. 4.5.3 READ - STOP separated format (SX1501 and SX1502 only) When operating SX1501 or SX1502, stop-separated reads can also be used. This format allows a master to set up the register address pointer for a read and return to that slave at a later time to read the data. In this format the slave address followed by a write command are sent after a start [S] condition. The slave then acknowledges it is being addressed, and the master responds with the 8-bit register address. The master sends a Stop or Restart condition and may then address another slave. After performing other tasks, the master can send a start or restart condition to the slave with a read command. The slave acknowledges this request and returns the data from the register location that had previously been set up. nd Rev 7 – 2 Oct. 2008 www.semtech.com 16 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Master operations SX1501, SX1502 or SX1503 operations (Slave) S: Start Condition W: Write = ‘0’ R: Read = ‘1’ A: Acknowledge (sent by slave) NACK: Non-Acknowledge (sent by master) Sr: Repeated Start Condition P: Stop condition Slave Address: 7 bit Register Address: 8 bit Data: 8 bit Figure 11 - 2-Wire Serial Interface, Read – Stop Separated Mode Operation 4.6 Interrupt (NINT) At start-up, the transition detection logic is reset, and NINT is released to a high-impedance state. The interrupt mask register is set to 0xFF, disabling the interrupt output for transitions on all I/O ports. The transition flags are cleared to indicate no data changes. An interrupt NINT can be generated on any programmed combination of I/Os rising and/or falling edges through the RegInterruptMask and RegSense registers. If needed, the I/Os which triggered the interrupt can then be identified by reading RegInterruptSource register. When NINT is low (i.e. interrupt occurred), it can be reset back high (i.e. cleared) by writing 0xFF in RegInterruptSource (this will also clear corresponding bits in RegEventStatus register). SX1503 also allows the interrupt to be cleared automatically when reading RegData register (Cf. RegAdvanced) Example: We want to detect rising edge of I/O[1] on SX1502 (NINT will go low). 1. We enable interrupt on I/O[1] in RegInterruptMask  RegInterruptMask =“XXXXXX0X” 2. We set edge sense for I/O[1] in RegSense  RegSenseLow =“XXXX01XX” 4.7 Programmable Logic Functions (PLD) The SX1501, SX1502 and SX1503 offer a unique fully programmable logic functions like a PLD to give more flexibility and reduce external logic gates used for standard applications. Since the whole truth table is fully programmable, the SX1501, SX1502, and SX1503 can implement combinatory functions ranging from the basic AND/OR gates to the most complicated ones with up to four 3-to1 PLDs or two 3-to-2 PLDs which can also be externally cascaded if needed. In all cases, any IO not configured for PLD functionality retains its GPIO functionality while I/Os used by the PLD have their direction automatically set accordingly. Please note that while RegDir corresponding bits are ignored for PLD operation they may still be set to input to access unused PLD inputs as normal GPI (PLD truth table can define some inputs to have no effect on PLD output) and/or generate interrupt based on any of the PLD inputs or outputs bits. 4.7.1 SX1501 The SX1501 I/Os can be configured to provide any combinational 2-to-1 logic function using I/O[0-2] whilst retaining GPIO capability on I/O[3] OR provide a combinational 3-to-1 decode function using all 4 I/O ports. RegPLDMode SX1501 I/Os 1:0 3 2 1 00 GPIO GPIO GPIO 01 GPIO PLD OUT PLD IN 10 PLD OUT PLD IN PLD IN Table 8 – SX1501 PLD Modes Settings nd Rev 7 – 2 Oct. 2008 0 GPIO PLD IN PLD IN www.semtech.com 17 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 4.7.2 SX1502 The SX1502 I/Os can be configured as per the SX1501, and can additionally be configured to provide a 2-to-1 logic function on I/O[4-6], 3-to-1 logic function on I/O[4-7], or 3-to-2 logic decode on I/O[0-4]. RegPLDMode 5:4 1:0 00 00 00 01 00 10 00 11 01 00 01 01 01 10 01 11 10 00 10 01 10 10 10 11 SX1502 I/Os 7 6 5 4 3 2 GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO PLD OUT GPIO GPIO GPIO GPIO PLD OUT PLD IN GPIO GPIO GPIO PLD OUT PLD OUT PLD IN GPIO PLD OUT PLD IN PLD IN GPIO GPIO GPIO PLD OUT PLD IN PLD IN GPIO PLD OUT GPIO PLD OUT PLD IN PLD IN PLD OUT PLD IN GPIO GPIO GPIO PLD OUT PLD OUT PLD IN PLD OUT PLD IN PLD IN PLD IN GPIO GPIO PLD OUT PLD IN PLD IN PLD IN GPIO PLD OUT PLD OUT PLD IN PLD IN PLD IN PLD OUT PLD IN GPIO GPIO GPIO PLD OUT PLD OUT PLD IN Table 9 – SX1502 PLD Modes Settings 1 GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN 0 GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN SX1503 I/Os 15 14 13 12 11 10 GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO PLD OUT GPIO GPIO GPIO GPIO PLD OUT PLD IN GPIO GPIO GPIO PLD OUT PLD OUT PLD IN GPIO PLD OUT PLD IN PLD IN GPIO GPIO GPIO PLD OUT PLD IN PLD IN GPIO PLD OUT GPIO PLD OUT PLD IN PLD IN PLD OUT PLD IN GPIO GPIO GPIO PLD OUT PLD OUT PLD IN PLD OUT PLD IN PLD IN PLD IN GPIO GPIO PLD OUT PLD IN PLD IN PLD IN GPIO PLD OUT PLD OUT PLD IN PLD IN PLD IN PLD OUT PLD IN GPIO GPIO GPIO PLD OUT PLD OUT PLD IN Table 10 – SX1503 PLD Modes Settings (Bank B) 9 GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN 8 GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN RegPLDModeA SX1503 I/Os 5:4 1:0 7 6 5 4 3 2 00 00 GPIO GPIO GPIO GPIO GPIO GPIO 00 01 GPIO GPIO GPIO GPIO GPIO PLD OUT 00 10 GPIO GPIO GPIO GPIO PLD OUT PLD IN 00 11 GPIO GPIO GPIO PLD OUT PLD OUT PLD IN 01 00 GPIO PLD OUT PLD IN PLD IN GPIO GPIO 01 01 GPIO PLD OUT PLD IN PLD IN GPIO PLD OUT 01 10 GPIO PLD OUT PLD IN PLD IN PLD OUT PLD IN 01 11 GPIO GPIO GPIO PLD OUT PLD OUT PLD IN 10 00 PLD OUT PLD IN PLD IN PLD IN GPIO GPIO 10 01 PLD OUT PLD IN PLD IN PLD IN GPIO PLD OUT 10 10 PLD OUT PLD IN PLD IN PLD IN PLD OUT PLD IN 10 11 GPIO GPIO GPIO PLD OUT PLD OUT PLD IN Table 11 – SX1503 PLD Modes Settings (Bank B) 1 GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN 0 GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN GPIO PLD IN PLD IN PLD IN 4.7.3 SX1503 Each of the two I/O banks of the SX1503 I/Os can be configured as per the SX1502. RegPLDModeB 5:4 1:0 00 00 00 01 00 10 00 11 01 00 01 01 01 10 01 11 10 00 10 01 10 10 10 11 nd Rev 7 – 2 Oct. 2008 www.semtech.com 18 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 4.7.4 Tutorial The generic method described in this paragraph can be applied to any of the SX1501, SX1502 or SX1503. Example: We want to implement an AND gate between I/O[0] and IO[1] on SX1502 1. Identify in the tables above the RegPLDMode setting to be programmed. What we need corresponds to the second line of the SX1502 PLD Table => RegPLDMode = “xx00xx01” 2. Fill corresponding RegPLDTableX with the wanted truth table. As mentioned in RegPLDMode description, using PLD 2-to-1 mode on I/0[0-2] implies to fill the truth table located in RegPLDTable0(3:0) I/O[1] 0 0 1 1 I/O[0] 0 1 0 1 I/O[2] 0 0 0 1 => RegPLDTable0 = “xxxx1000” nd Rev 7 – 2 Oct. 2008 www.semtech.com 19 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 5 5.1 CONFIGURATION REGISTERS SX1501 4-channel GPIO Address 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x10 0x11 0x12 0x13 0x14 0x15 0xAB Name Description RegData RegDir RegPullUp RegPullDown Reserved RegInterruptMask RegSenseHigh RegSenseLow RegInterruptSource RegEventStatus RegPLDMode RegPLDTable0 RegPLDTable1 RegPLDTable2 RegPLDTable3 RegPLDTable4 RegAdvanced Data register Direction register Pull-up register Pull-down register Unused Interrupt mask register Unused Sense register Interrupt source register Event status register PLD mode register PLD truth table 0 Unused PLD truth table 2 Unused Unused Advanced settings register Default 1111 1111* 1111 1111 0000 0000 0000 0000 XXXX XXXX 1111 1111 XXXX XXXX 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 XXXX XXXX 0000 0000 XXXX XXXX XXXX XXXX 0000 0000 *Bits set as output take “1” as default value. Table 12 – SX1501 Configuration Registers Overview Addr Name Default Bits 7:4 0x00 RegData 0xFF 3:0 7:4 0x01 RegDir 0xFF 3:0 7:4 0x02 RegPullUp 0x00 0x03 RegPullDown 0x00 0x04 Reserved 0xXX 0x05 RegInterruptMask 0xFF 0x06 RegSenseHigh 0xXX 0x07 RegSenseLow 0x00 3:0 7:4 0x08 RegInterruptSource 0x09 0x00 0x00 3:0 7:0 7:4 3:0 7:0 7:6 5:4 3:2 1:0 7:4 Description Reserved. Must be set to 1 (default value) Write: Data to be output to the output-configured IOs Read: Data seen at the IOs, independent of the direction configured. Reserved. Must be set to 1 (default value) Configures direction for each IO. 0 : IO is configured as an output 1 : IO is configured as an input Reserved. Must be set to 0 (default value) Enables the pull-up for each IO 0 : Pull-up is disabled 1 : Pull-up is enabled Reserved. Must be set to 0 (default value) Enables the pull-down for each IO 0 : Pull-down is disabled 1 : Pull-down is enabled Unused Reserved. Must be set to 1 (default value) Configures which [input-configured] IO will trigger an interrupt on NINT pin 0 : An event on this IO will trigger an interrupt 1 : An event on this IO will NOT trigger an interrupt Unused Edge sensitivity of I/O[3] 00 : None Edge sensitivity of I/O[2] 01 : Rising 10 : Falling Edge sensitivity of I/O[1] 11 : Both Edge sensitivity of I/O[0] 3:0 Reserved. Must be set to 0 (default value) Interrupt source (from IOs set in RegInterruptMask) 0 : No interrupt has been triggered by this IO 1 : An interrupt has been triggered by this IO (an event as configured in relevant RegSense register occured). 7:4 Writing '1' clears the bit in RegInterruptSource and in RegEventStatus. When all bits are cleared, NINT signal goes back high. Reserved. Must be set to 0 (default value) nd Rev 7 – 2 Oct. 2008 www.semtech.com 20 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Addr Name Default Bits RegEventStatus 3:0 7:2 0x10 0x00 RegPLDMode 0x11 RegPLDTable0 0x00 0x12 RegPLDTable1 0xXX 0x13 RegPLDTable2 0x00 0x14 0x15 RegPLDTable3 RegPLDTable4 0xXX 0xXX 0xAB RegAdvanced 0x00 1:0 7:4 3 2 1 0 7:0 7 6 5 4 3 2 1 0 7:0 7:0 7.2 1 0 Description Event status of all IOs. 0 : No event has occured on this IO 1 : An event has occured on this IO (an edge as configured in relevant RegSense register occured). Writing '1' clears the bit in RegEventStatus and in RegInterruptSource if relevant. If the edge sensitivity of the IO is changed, the bit(s) will be cleared automatically Reserved. Must be set to 0 (default value) PLDMode 00 : PLD disabled – Normal GPIO mode for I/O[3:0] 01 : PLD 2-to-1 mode – I/O[2] is a decode of I/O[1:0] as defined in RegPLDTable0 10 : PLD 3-to-1 mode – I/O[3] is a decode of I/O[2:0] as defined in RegPLDTable2 11 : Not used Reserved. Must be set to 0 (default value) Value to be output on I/O[2] when I/O[1:0] = 11 Value to be output on I/O[2] when I/O[1:0] = 10 Applies only when PLDMode is set to PLD 2-to-1 mode Value to be output on I/O[2] when I/O[1:0] = 01 Value to be output on I/O[2] when I/O[1:0] = 00 Unused Value to be output on I/O[3] when I/O[2:0] = 111 Value to be output on I/O[3] when I/O[2:0] = 110 Value to be output on I/O[3] when I/O[2:0] = 101 Value to be output on I/O[3] when I/O[2:0] = 100 Applies only when PLDMode is set to PLD 3-to-1 mode Value to be output on I/O[3] when I/O[2:0] = 011 Value to be output on I/O[3] when I/O[2:0] = 010 Value to be output on I/O[3] when I/O[2:0] = 001 Value to be output on I/O[3] when I/O[2:0] = 000 Unused Unused Reserved. Must be set to 0 (default value) Boost Mode (Cf. §2.2.1) 0: OFF 1: ON Reserved. Must be set to 0 (default value) Table 13 – SX1501 Configuration Registers Description 5.2 SX1502 8-channel GPIO Address 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x10 0x11 0x12 0x13 0x14 0x15 0xAB Name Description RegData RegDir RegPullUp RegPullDown Reserved RegInterruptMask RegSenseHigh RegSenseLow RegInterruptSource RegEventStatus RegPLDMode RegPLDTable0 RegPLDTable1 RegPLDTable2 RegPLDTable3 RegPLDTable4 RegAdvanced Data register Direction register Pull-up register Pull-down register Unused Interrupt mask register Sense register for I/O[7:4] Sense register for I/O[3:0] Interrupt source register Event status register PLD mode register PLD truth table 0 PLD truth table 1 PLD truth table 2 PLD truth table 3 PLD truth table 4 Advanced settings register Default 1111 1111* 1111 1111 0000 0000 0000 0000 XXXX XXXX 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 *Bits set as output take “1” as default value. Table 14 – SX1502 Configuration Registers Overview Addr Name Default Bits 0x00 RegData 0xFF 7:0 0x01 RegDir 0xFF 7:0 Description Write: Data to be output to the output-configured IOs Read: Data seen at the IOs, independent of the direction configured. Configures direction for each IO. 0 : IO is configured as an output 1 : IO is configured as an input nd Rev 7 – 2 Oct. 2008 www.semtech.com 21 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Addr Name Default Bits 7:6 5:4 3:2 1:0 7:6 5:4 3:2 1:0 Enables the pull-up for each IO 0 : Pull-up is disabled 1 : Pull-up is enabled Enables the pull-down for each IO 0 : Pull-down is disabled 1 : Pull-down is enabled Unused Configures which [input-configured] IO will trigger an interrupt on NINT pin 0 : An event on this IO will trigger an interrupt 1 : An event on this IO will NOT trigger an interrupt Edge sensitivity of I/O[7] 00 : None Edge sensitivity of I/O[6] 01 : Rising 10 : Falling Edge sensitivity of I/O[5] 11 : Both Edge sensitivity of I/O[4] Edge sensitivity of I/O[3] 00 : None Edge sensitivity of I/O[2] 01 : Rising 10 : Falling Edge sensitivity of I/O[1] 11 : Both Edge sensitivity of I/O[0] 7:0 Interrupt source (from IOs set in RegInterruptMask) 0 : No interrupt has been triggered by this IO 1 : An interrupt has been triggered by this IO (an event as configured in relevant RegSense register occured). 7:0 Writing '1' clears the bit in RegInterruptSource and in RegEventStatus When all bits are cleared, NINT signal goes back high. Event status of all IOs. 0 : No event has occured on this IO 1 : An event has occured on this IO (an edge as configured in relevant RegSense register occured). 0x02 RegPullUp 0x00 7:0 0x03 RegPullDown 0x00 7:0 0x04 Reserved 0xXX 7:0 0x05 RegInterruptMask 0xFF 7:0 0x06 RegSenseHigh 0x00 0x07 RegSenseLow 0x00 0x08 0x09 RegInterruptSource RegEventStatus 0x00 0x00 7:6 5:4 0x10 RegPLDMode 0x00 3:2 1:0 0x11 RegPLDTable0 0x00 0x12 RegPLDTable1 0x00 0x13 RegPLDTable2 0x00 Description 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 Writing '1' clears the bit in RegEventStatus and in RegInterruptSource if relevant. If the edge sensitivity of the IO is changed, the bit(s) will be cleared automatically Reserved. Must be set to 0 (default value) PLDModeHigh (applies to I/O[7:4]) 00 : PLD disabled – Normal GPIO mode for I/O[7:4] 01 : PLD 2-to-1 mode – I/O[6] is a decode of I/O[5:4] as defined in RegPLDTable0 10 : PLD 3-to-1 mode – I/O[7] is a decode of I/O[6:4] as defined in RegPLDTable1 11 : Reserved Reserved. Must be set to 0 (default value) PLDModeLow (applies to I/O[3:0]) 00 : PLD disabled – Normal GPIO mode for I/O[3:0] 01 : PLD 2-to-1 mode – I/O[2] is a decode of I/O[1:0] as defined in RegPLDTable0 10 : PLD 3-to-1 mode – I/O[3] is a decode of I/O[2:0] as defined in RegPLDTable2 11 : PLD 3-to-2 mode – I/O[4:3] are decodes of I/O[2:0] as defined in RegPLDTable3 and RegPLDTable4 Value to be output on I/O[6] when I/O[5:4] = 11 Applies only when Value to be output on I/O[6] when I/O[5:4] = 10 PLDModeHigh is set to PLD 2Value to be output on I/O[6] when I/O[5:4] = 01 to-1 mode Value to be output on I/O[6] when I/O[5:4] = 00 Value to be output on I/O[2] when I/O[1:0] = 11 Applies only when Value to be output on I/O[2] when I/O[1:0] = 10 PLDModeLow is set to PLD 2Value to be output on I/O[2] when I/O[1:0] = 01 to-1 mode Value to be output on I/O[2] when I/O[1:0] = 00 Value to be output on I/O[7] when I/O[6:4] = 111 Value to be output on I/O[7] when I/O[6:4] = 110 Value to be output on I/O[7] when I/O[6:4] = 101 Applies only when Value to be output on I/O[7] when I/O[6:4] = 100 PLDModeHigh is set to PLD 3Value to be output on I/O[7] when I/O[6:4] = 011 to-1 mode Value to be output on I/O[7] when I/O[6:4] = 010 Value to be output on I/O[7] when I/O[6:4] = 001 Value to be output on I/O[7] when I/O[6:4] = 000 Applies only when Value to be output on I/O[3] when I/O[2:0] = 111 PLDModeLow is set to PLD 3Value to be output on I/O[3] when I/O[2:0] = 110 to-1 mode Value to be output on I/O[3] when I/O[2:0] = 101 Value to be output on I/O[3] when I/O[2:0] = 100 Value to be output on I/O[3] when I/O[2:0] = 011 Value to be output on I/O[3] when I/O[2:0] = 010 nd Rev 7 – 2 Oct. 2008 www.semtech.com 22 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Addr Name Default 0x14 RegPLDTable3 0x00 0x15 RegPLDTable4 0x00 0xAB RegAdvanced 0x00 Bits 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7:2 1 0 Description Value to be output on I/O[3] when I/O[2:0] = 001 Value to be output on I/O[3] when I/O[2:0] = 000 Value to be output on I/O[4] when I/O[2:0] = 111 Value to be output on I/O[4] when I/O[2:0] = 110 Value to be output on I/O[4] when I/O[2:0] = 101 Value to be output on I/O[4] when I/O[2:0] = 100 Value to be output on I/O[4] when I/O[2:0] = 011 Value to be output on I/O[4] when I/O[2:0] = 010 Value to be output on I/O[4] when I/O[2:0] = 001 Value to be output on I/O[4] when I/O[2:0] = 000 Value to be output on I/O[3] when I/O[2:0] = 111 Value to be output on I/O[3] when I/O[2:0] = 110 Value to be output on I/O[3] when I/O[2:0] = 101 Value to be output on I/O[3] when I/O[2:0] = 100 Value to be output on I/O[3] when I/O[2:0] = 011 Value to be output on I/O[3] when I/O[2:0] = 010 Value to be output on I/O[3] when I/O[2:0] = 001 Value to be output on I/O[3] when I/O[2:0] = 000 Reserved. Must be set to 0 (default value) Boost Mode (Cf. §§2.2.1) 0: OFF 1: ON Reserved. Must be set to 0 (default value) Applies only when PLDModeLow is set to PLD 3to-2 mode Applies only when PLDModeLow is set to PLD 3to-2 mode Table 15 – SX1502 Configuration Registers Description 5.3 SX1503 16-channel GPIO Address 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 0x10 0x11 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2A 0x2B 0xAD Name Description RegDataB RegDataA RegDirB RegDirA RegPullUpB RegPullUpA RegPullDownB RegPullDownA RegInterruptMaskB RegInterruptMaskA RegSenseHighB RegSenseHighA RegSenseLowB RegSenseLowA RegInterruptSourceB RegInterruptSourceA RegEventStatusB RegEventStatusA RegPLDModeB RegPLDModeA RegPLDTable0B RegPLDTable0A RegPLDTable1B RegPLDTable1A RegPLDTable2B RegPLDTable2A RegPLDTable3B RegPLDTable3A RegPLDTable4B RegPLDTable4A RegAdvanced Data register for Bank B I/O[15:8] Data register for Bank A I/O[7:0] Direction register for Bank B I/O[15:8] Direction register for Bank A I/O[7:0] Pull-up register for Bank B I/O[15:8] Pull-up register for Bank A I/O[7:0] Pull-down register for Bank B I/O[15:8] Pull-down register for Bank A I/O[7:0] Interrupt mask register for Bank B I/O[15:8] Interrupt mask register for Bank A I/O[7:0] Sense register for I/O[15:12] Sense register for I/O[7:4] Sense register for I/O[11:8] Sense register for I/O[3:0] Interrupt source register for Bank B I/O[15:8] Interrupt source register for Bank A I/O[7:0] Event status register for Bank B I/O[15:8] Event status register for Bank A I/O[7:0] PLD mode register for Bank B I/O[15:8] PLD mode register for Bank A I/O[7:0] PLD truth table 0 for Bank B I/O[15:8] PLD truth table 0 for Bank A I/O[7:0] PLD truth table 1 for Bank B I/O[15:8] PLD truth table 1 for Bank A I/O[7:0] PLD truth table 2 for Bank B I/O[15:8] PLD truth table 2 for Bank A I/O[7:0] PLD truth table 3 for Bank B I/O[15:8] PLD truth table 3 for Bank A I/O[7:0] PLD truth table 4 for Bank B I/O[15:8] PLD truth table 4 for Bank A I/O[7:0] Advanced settings register Default 1111 1111* 1111 1111* 1111 1111 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 *Bits set as output take “1” as default value. Table 16 – SX1503 Configuration Registers Overview nd Rev 7 – 2 Oct. 2008 www.semtech.com 23 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Addr Name Default Bits 7:0 7:0 Writing '1' clears the bit in RegInterruptSourceB and in RegEventStatusB When all bits of both RegInterruptSourceA/B are cleared, NINT signal goes back high. Interrupt source (from IOs set in RegInterruptMaskA) 0 : No interrupt has been triggered by this IO 1 : An interrupt has been triggered by this IO (an event as configured in relevant RegSense register occured). 7:0 Writing '1' clears the bit in RegInterruptSourceA and in RegEventStatusA When all bits of both RegInterruptSourceA/B are cleared, NINT signal goes back high. Event status of all IOs. 0 : No event has occured on this IO 1 : An event has occured on this IO (an edge as configured in relevant RegSense register occured). 0x00 RegDataB 0xFF 7:0 0x01 RegDataA 0xFF 7:0 0x02 RegDirB 0xFF 7:0 0x03 RegDirA 0xFF 7:0 0x04 RegPullUpB 0x00 7:0 0x05 RegPullUpA 0x00 7:0 0x06 RegPullDownB 0x00 7:0 0x07 RegPullDownA 0x00 7:0 0x08 RegInterruptMaskB 0xFF 7:0 0x09 RegInterruptMaskA 0xFF 7:0 0x0A RegSenseHighB 0x00 0x0B RegSenseHighA 0x00 0x0C RegSenseLowB 0x00 0x0D RegSenseLowA 0x00 0x0E RegInterruptSourceB 0x00 0x0F 0x10 RegInterruptSourceA RegEventStatusB 0x00 0x00 Description Write: Data to be output to the output-configured IOs Read: Data seen at the IOs, independent of the direction configured. Write: Data to be output to the output-configured IOs Read: Data seen at the IOs, independent of the direction configured. Configures direction for each IO. 0 : IO is configured as an output 1 : IO is configured as an input Configures direction for each IO. 0 : IO is configured as an output 1 : IO is configured as an input Enables the pull-up for each IO 0 : Pull-up is disabled 1 : Pull-up is enabled Enables the pull-up for each IO 0 : Pull-up is disabled 1 : Pull-up is enabled Enables the pull-down for each IO 0 : Pull-down is disabled 1 : Pull-down is enabled Enables the pull-down for each IO 0 : Pull-down is disabled 1 : Pull-down is enabled Configures which [input-configured] IO will trigger an interrupt on NINT pin 0 : An event on this IO will trigger an interrupt 1 : An event on this IO will NOT trigger an interrupt Configures which [input-configured] IO will trigger an interrupt on NINT pin 0 : An event on this IO will trigger an interrupt 1 : An event on this IO will NOT trigger an interrupt Edge sensitivity of I/O[15] 00 : None 01 : Rising Edge sensitivity of I/O[14] 10 : Falling Edge sensitivity of I/O[13] 11 : Both Edge sensitivity of I/O[12] Edge sensitivity of I/O[7] 00 : None 01 : Rising Edge sensitivity of I/O[6] 10 : Falling Edge sensitivity of I/O[5] 11 : Both Edge sensitivity of I/O[4] Edge sensitivity of I/O[11] 00 : None 01 : Rising Edge sensitivity of I/O[10] 10 : Falling Edge sensitivity of I/O[9] 11 : Both Edge sensitivity of I/O[8] Edge sensitivity of I/O[3] 00 : None Edge sensitivity of I/O[2] 01 : Rising 10 : Falling Edge sensitivity of I/O[1] 11 : Both Edge sensitivity of I/O[0] Interrupt source (from IOs set in RegInterruptMaskB) 0 : No interrupt has been triggered by this IO 1 : An interrupt has been triggered by this IO (an event as configured in relevant RegSense register occured). 7:6 5:4 3:2 1:0 7:6 5:4 3:2 1:0 7:6 5:4 3:2 1:0 7:6 5:4 3:2 1:0 Writing '1' clears the bit in RegEventStatusB and in RegInterruptSourceB if relevant. If the edge sensitivity of the IO is changed, the bit(s) will be cleared automatically nd Rev 7 – 2 Oct. 2008 www.semtech.com 24 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Addr 0x11 Name RegEventStatusA Default 0x00 Bits 7:0 7:6 5:4 0x20 RegPLDModeB 0x00 3:2 1:0 7:6 5:4 0x21 RegPLDModeA 0x00 3:2 1:0 0x22 RegPLDTable0B 0x00 0x23 RegPLDTable0A 0x00 0x24 RegPLDTable1B 0x00 0x25 RegPLDTable1A 0x00 0x26 0x00 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 Description Event status of all IOs. 0 : No event has occured on this IO 1 : An event has occured on this IO (an edge as configured in relevant RegSense register occured). Writing '1' clears the bit in RegEventStatusA and in RegInterruptSourceA if relevant. If the edge sensitivity of the IO is changed, the bit(s) will be cleared automatically Reserved. Must be set to 0 (default value) PLDModeHighB (applies to I/O[15:12]) 00 : PLD disabled – Normal GPIO mode for I/O[15:12] 01 : PLD 2-to-1 mode – I/O[14] is a decode of I/O[13:12] as defined in RegPLDTable0B 10 : PLD 3-to-1 mode – I/O[15] is a decode of I/O[14:12] as defined in RegPLDTable1B 11 : Reserved Reserved. Must be set to 0 (default value) PLDModeLowB (applies to I/O[11:8]) 00 : PLD disabled – Normal GPIO mode for I/O[11:8] 01 : PLD 2-to-1 mode – I/O[10] is a decode of I/O[9:8] as defined in RegPLDTable0B 10 : PLD 3-to-1 mode – I/O[11] is a decode of I/O[10:8] as defined in RegPLDTable2B 11 : PLD 3-to-2 mode – I/O[12:11] are decodes of I/O[10:8] as defined in RegPLDTable3B and RegPLDTable4B Reserved. Must be set to 0 (default value) PLDModeHighA (applies to I/O[7:4]) 00 : PLD disabled – Normal GPIO mode for I/O[7:4] 01 : PLD 2-to-1 mode – I/O[6] is a decode of I/O[5:4] as defined in RegPLDTable0A 10 : PLD 3-to-1 mode – I/O[7] is a decode of I/O[6:4] as defined in RegPLDTable1A 11 : Reserved Reserved. Must be set to 0 (default value) PLDModeLowA (applies to I/O[3:0]) 00 : PLD disabled – Normal GPIO mode for I/O[3:0] 01 : PLD 2-to-1 mode – I/O[2] is a decode of I/O[1:0] as defined in RegPLDTable0A 10 : PLD 3-to-1 mode – I/O[3] is a decode of I/O[2:0] as defined in RegPLDTable2A 11 : PLD 3-to-2 mode – I/O[4:3] are decodes of I/O[2:0] as defined in RegPLDTable3A and RegPLDTable4A Value to be output on I/O[14] when I/O[13:12] = 11 Applies only when Value to be output on I/O[14] when I/O[13:12] = 10 PLDModeHighB is set to PLD Value to be output on I/O[14] when I/O[13:12] = 01 2-to-1 mode Value to be output on I/O[14] when I/O[13:12] = 00 Value to be output on I/O[10] when I/O[9:8] = 11 Applies only when Value to be output on I/O[10] when I/O[9:8] = 10 PLDModeLowB is set to PLD Value to be output on I/O[10] when I/O[9:8] = 01 2-to-1 mode Value to be output on I/O[10] when I/O[9:8] = 00 Value to be output on I/O[6] when I/O[5:4] = 11 Applies only when Value to be output on I/O[6] when I/O[5:4] = 10 PLDModeHighA is set to PLD Value to be output on I/O[6] when I/O[5:4] = 01 2-to-1 mode Value to be output on I/O[6] when I/O[5:4] = 00 Value to be output on I/O[2] when I/O[1:0] = 11 Applies only when Value to be output on I/O[2] when I/O[1:0] = 10 PLDModeLowA is set to PLD Value to be output on I/O[2] when I/O[1:0] = 01 2-to-1 mode Value to be output on I/O[2] when I/O[1:0] = 00 Value to be output on I/O[15] when I/O[14:12] = 111 Value to be output on I/O[15] when I/O[14:12] = 110 Value to be output on I/O[15] when I/O[14:12] = 101 Applies only when Value to be output on I/O[15] when I/O[14:12] = 100 PLDModeHighB is set to PLD Value to be output on I/O[15] when I/O[14:12] = 011 3-to-1 mode Value to be output on I/O[15] when I/O[14:12] = 010 Value to be output on I/O[15] when I/O[14:12] = 001 Value to be output on I/O[15] when I/O[14:12] = 000 Value to be output on I/O[7] when I/O[6:4] = 111 Value to be output on I/O[7] when I/O[6:4] = 110 Value to be output on I/O[7] when I/O[6:4] = 101 Applies only when Value to be output on I/O[7] when I/O[6:4] = 100 PLDModeHighA is set to PLD Value to be output on I/O[7] when I/O[6:4] = 011 3-to-1 mode Value to be output on I/O[7] when I/O[6:4] = 010 Value to be output on I/O[7] when I/O[6:4] = 001 Value to be output on I/O[7] when I/O[6:4] = 000 Value to be output on I/O[11] when I/O[10:8] = 111 Applies only when nd Rev 7 – 2 Oct. 2008 www.semtech.com 25 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING Addr Name Default RegPLDTable2B 0x27 RegPLDTable2A 0x00 0x28 RegPLDTable3B 0x00 0x29 RegPLDTable3A 0x00 0x2A RegPLDTable4B 0x00 0x2B RegPLDTable4A 0x00 Bits Description 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7:3 PLDModeLowB is set to PLD Value to be output on I/O[11] when I/O[10:8] = 110 3-to-1 mode Value to be output on I/O[11] when I/O[10:8] = 101 Value to be output on I/O[11] when I/O[10:8] = 100 Value to be output on I/O[11] when I/O[10:8] = 011 Value to be output on I/O[11] when I/O[10:8] = 010 Value to be output on I/O[11] when I/O[10:8] = 001 Value to be output on I/O[11] when I/O[10:8] = 000 Value to be output on I/O[3] when I/O[2:0] = 111 Value to be output on I/O[3] when I/O[2:0] = 110 Value to be output on I/O[3] when I/O[2:0] = 101 Applies only when Value to be output on I/O[3] when I/O[2:0] = 100 PLDModeLowA is set to PLD Value to be output on I/O[3] when I/O[2:0] = 011 3-to-1 mode Value to be output on I/O[3] when I/O[2:0] = 010 Value to be output on I/O[3] when I/O[2:0] = 001 Value to be output on I/O[3] when I/O[2:0] = 000 Value to be output on I/O[11] when I/O[10:8] = 111 Value to be output on I/O[11] when I/O[10:8] = 110 Value to be output on I/O[11] when I/O[10:8] = 101 Applies only when Value to be output on I/O[11] when I/O[10:8] = 100 PLDModeLowB is set to PLD Value to be output on I/O[11] when I/O[10:8] = 011 3-to-2 mode Value to be output on I/O[11] when I/O[10:8] = 010 Value to be output on I/O[11] when I/O[10:8] = 001 Value to be output on I/O[11] when I/O[10:8] = 000 Value to be output on I/O[3] when I/O[2:0] = 111 Value to be output on I/O[3] when I/O[2:0] = 110 Value to be output on I/O[3] when I/O[2:0] = 101 Applies only when Value to be output on I/O[3] when I/O[2:0] = 100 PLDModeLowA is set to PLD Value to be output on I/O[3] when I/O[2:0] = 011 3-to-2 mode Value to be output on I/O[3] when I/O[2:0] = 010 Value to be output on I/O[3] when I/O[2:0] = 001 Value to be output on I/O[3] when I/O[2:0] = 000 Value to be output on I/O[12] when I/O[10:8] = 111 Value to be output on I/O[12] when I/O[10:8] = 110 Value to be output on I/O[12] when I/O[10:8] = 101 Applies only when Value to be output on I/O[12] when I/O[10:8] = 100 PLDModeLowB is set to PLD Value to be output on I/O[12] when I/O[10:8] = 011 3-to-2 mode Value to be output on I/O[12] when I/O[10:8] = 010 Value to be output on I/O[12] when I/O[10:8] = 001 Value to be output on I/O[12] when I/O[10:8] = 000 Value to be output on I/O[4] when I/O[2:0] = 111 Value to be output on I/O[4] when I/O[2:0] = 110 Value to be output on I/O[4] when I/O[2:0] = 101 Applies only when Value to be output on I/O[4] when I/O[2:0] = 100 PLDModeLowA is set to PLD Value to be output on I/O[4] when I/O[2:0] = 011 3-to-2 mode Value to be output on I/O[4] when I/O[2:0] = 010 Value to be output on I/O[4] when I/O[2:0] = 001 Value to be output on I/O[4] when I/O[2:0] = 000 Reserved. Must be set to 0 (default value) Autoclear NINT on RegData read (Cf. §4.6) 0: OFF.RegInterruptSource must be manually cleared directly or via RegEventStatus 1: ON.RegInterruptSource is automatically cleared when RegDataB or RegDataA is read Boost Mode (Cf. §2.2.1) 0: OFF 1: ON Reserved. Must be set to 0 (default value) 2 0xAD RegAdvanced 0x00 1 0 Table 17 – SX1503 Configuration Registers Description nd Rev 7 – 2 Oct. 2008 www.semtech.com 26 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 6 APPLICATION INFORMATION 6.1 Typical Application Circuit 3.3V SX1502 VCC1 VDDM I/O[0] I/O[1] I/O[2] I/O[3] NRESET Host controller I/O 2.5V 5V 5V 1.2V SCL SCL SDA SDA I/O VCC2 I/O[4] I/O[5] I/O[6] I/O[7] ADDR NINT GND Optional (depends on the application) Figure 12 - Typical Application Schematic 6.2 Typical LED Operation Typical LED operation is described below. The LED is usually connected to a high voltage (VBAT) to take advantage of the high sink current of the I/O and to accommodate high LED threshold voltages (VLED). VCCx VBAT VCCx * VLED SX1501/2/3 R IOx IOL * LED colour/technology dependent Figure 13 – Typical LED Operation Important:  VCCx must exceed VBAT-VLED (VCCx = VBAT is recommended) else the LED will never be completely OFF  R must be calculated for IOL not to exceed its max spec (Cf. Table 5) 6.2.1 LED ON/OFF Control RegDir[x] LED ON LED OFF “0” (Output) RegData[x] “0” “1” Table 18 – LED ON/OFF Control nd Rev 7 – 2 Oct. 2008 www.semtech.com 27 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 6.2.2 LED Intensity Control When the max IOL spec is not enough it is possible to drive simultaneously multiple I/Os connected together hence increasing the total sink capability. Example: on an SX1502, by driving an LED with both IO[2] and IO[3] one can sink up to 24+24 =48mA. Driving an LED with multiple I/Os can also be used to implement more intensity steps for the LED. Example: with two I/Os capable of sinking each 24mA the LED can sink a total of 0mA (no I/O set to “0”), 24mA (one I/O set to “0”) or 48mA (both I/Os set to “0”) => 3 LED intensity steps ( 4 steps with 3 I/Os, 5 steps with 4 I/Os, etc) 6.3 Keypad Implementation SX1501, SX1502, and SX1503 can be used to implement keypad applications up to 8x8 matrix (i.e. 64 keys) Example: We want to implement a 4x4matrix keypad on SX1502 SX1502 IO7 IO6 IO5 IO4 IO3 IO2 IO1 IO0 IO[7-0] as inputs with internal pull-ups enabled Figure 14 – 4x4 keypad connection to SX1502 1. Set all I/Os as inputs with internal pull-up (RegDir = 0xFF, RegPullUp = 0xFF) 2. Set NINT to be triggered on any IO’s falling edge (RegInterruptMask = 0x00, RegSenseHigh = 0xAA, RegSenseLow = 0xAA) 3. When NINT goes low read RegData (or RegInterruptSource) to know the X:Y coordinates of the button which has been pressed. 4. Clear NINT (RegInterruptSource = 0xFF, can be done automatically on SX1503 depending on RegAdvanced setting) 5. Restart from point 3 6.4 Level Shifter Implementation Hints Because of their I/O banks with independent supply voltages between 1.2V and 5.5V, the SX1502 and SX1503 can be easily used to perform level shifting of signals from one I/O bank to an other (uC reads I/O from one I/O bank and sends it back to the other I/O bank) This can save significant BOM cost in a final application where only a few slow signals need to be level-shifted. nd Rev 7 – 2 Oct. 2008 www.semtech.com 28 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 7 PACKAGING INFORMATION 7.1 QFN-UT 20-pin Outline Drawing QFN-UT 20-pin, 3 x 3 mm, 0.4 mm pitch Figure 15 - Packaging Information – QFN-UT 20-pin Outline Drawing 7.2 QFN-UT 20-pin Land Pattern Figure 16 - Packaging Information – QFN-UT 20-pin Land Pattern nd Rev 7 – 2 Oct. 2008 www.semtech.com 29 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 7.3 QFN-UT 28-pin Outline Drawing QFN-UT 28-pin, 4 x 4 mm, 0.4 mm pitch Figure 17 - Packaging Information – QFN-UT 28-pin Outline Drawing 7.4 QFN-UT 28-pin Land Pattern Figure 18 - Packaging Information – QFN-UT 28-pin Land Pattern nd Rev 7 – 2 Oct. 2008 www.semtech.com 30 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 7.5 TSSOP 20-pin Outline Drawing Figure 19 - Packaging Information – TSSOP 20-pin Outline Drawing 7.6 TSSOP 20-pin Land Pattern Figure 20 - Packaging Information – TSSOP 20-pin Land Pattern nd Rev 7 – 2 Oct. 2008 www.semtech.com 31 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 7.7 TSSOP 28-pin Outline Drawing Figure 21 - Packaging Information – TSSOP 28-pin Outline Drawing 7.8 TSSOP 28-pin Land Pattern Figure 22 - Packaging Information – TSSOP 28-pin Land Pattern nd Rev 7 – 2 Oct. 2008 www.semtech.com 32 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING 8 SOLDERING PROFILE The soldering reflow profile for the SX1501, SX1502 and SX1503 is described in the standard IPC/JEDEC JSTD-020C. For detailed information please go to http://www.jedec.org/download/search/jstd020c.pdf Figure 23 - Classification Reflow Profile (IPC/JEDEC J-STD-020C) nd Rev 7 – 2 Oct. 2008 www.semtech.com 33 SX1501/SX1502/SX1503 4/8/16 Channel Low Voltage GPIO ADVANCED COMMUNICATIONS & SENSING © Semtech 2008 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Contact Information Semtech Corporation Advanced Communications and Sensing Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 nd Rev 7 – 2 Oct. 2008 www.semtech.com 34