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IS31FL3218-GRLS2

IS31FL3218-GRLS2

  • 厂商:

    LUMISSIL

  • 封装:

    SOIC24

  • 描述:

    IC LED DRIVER 18CH CC PWM 24SOIC

  • 数据手册
  • 价格&库存
IS31FL3218-GRLS2 数据手册
IS31FL3218 18 CHANNELS LED DRIVER October 2020 GENERAL DESCRIPTION FEATURES IS31FL3218 is comprised of 18 constant current channels each with independent PWM control, designed for driving LEDs. The output current of each channel can be set at up to 38mA (Max.) by an external resistor. The average LED current of each channel can be changed in 256 steps by changing the PWM duty cycle through an I2C interface.        The chip can be turned off by pulling the SDB pin low or by using the software shutdown feature to reduce power consumption. The slave address is fixed “1010 1000”. 2.7V to 5.5V supply I2C interface, automatic address increment function Internal reset register Modulate LED brightness with 256 steps PWM Each channel can be controlled independently -40°C to +85°C temperature range QFN-24 (4mm×4mm), SOP-24 packages APPLICATIONS IS31FL3218 is available in QFN-24 (4mm × 4mm) and SOP-24 packages. It operates from 2.7V to 5.5V over the temperature range of -40°C to +85°C.   Mobile phones and other hand-held devices for LED display LED in home appliances TYPICAL APPLICATION CIRCUIT VBattery VBattery 3 OUT1 VCC 1 F OUT2 0.1 F OUT3 OUT4 OUT5 VDD 4.7k OUT6 5 6 Micro Controller OUT7 4.7k 24 IS31FL3218 OUT8 SDA OUT9 SCL OUT10 SDB OUT11 OUT12 100k OUT13 OUT14 2 OUT15 R_EXT OUT16 3.3k 4 OUT17 GND OUT18 Figure 1 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1 Typical Application Circuit Note 1: The maximum output current is set up to 23mA when REXT= 3.3kΩ. The maximum output current can be set by external resistor, REXT. Please refer to the detail information in Page 9. Note 2: The IC should be placed far away from the mobile antenna in order to prevent the EMI. Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 1 IS31FL3218 PIN CONFIGURATION Package Pin Configuration (Top View) QFN-24 SOP-24 PIN DESCRIPTION No. Pin Description 1 OUT18 Output channel for LEDs. 2 R_EXT Input terminal used to connect an external resistor. This regulates the output current. 3 VCC Power supply. 4 GND Ground. 5 SDA I2C serial data. 6 SCL I2C serial clock. 7~23 OUT1 ~ OUT17 Output channel for LEDs. 24 SDB Shutdown the chip when pulled low. Thermal Pad Connect to GND. Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 2 IS31FL3218 ORDERING INFORMATION Industrial Range: -40°C to +85°C Order Part No. Package QTY IS31FL3218-QFLS2-TR IS31FL3218-GRLS2-TR IS31FL3218-GRLS2 QFN-24, Lead-free SOP-24, Lead-free SOP-24, Lead-free 2500/Reel 1000/Reel 30/Tube Copyright  ©  2020  Lumissil  Microsystems.  All  rights  reserved.  Lumissil Microsystems reserves  the  right  to  make  changes  to  this  specification  and  its  products  at  any  time  without  notice.  Lumissil  Microsystems  assumes  no  liability  arising  out  of  the  application  or  use  of  any  information,  products  or  services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and  before placing orders for products.  Lumissil Microsystems does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can  reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in  such applications unless Lumissil Microsystems receives written assurance to its satisfaction, that:  a.) the risk of injury or damage has been minimized;  b.) the user assume all such risks; and  c.) potential liability of Lumissil Microsystems is adequately protected under the circumstances Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 3 IS31FL3218 ABSOLUTE MAXIMUM RATINGS Supply voltage, VCC Voltage at SCL, SDA, SDB, OUT1 ~ OUT18 Maximum junction temperature, TJMAX Storage temperature range, TSTG Operating temperature range, TA Package thermal resistance, junction to ambient (4 layer standard test PCB based on JESD 51-2A), θJA ESD (HBM) ESD (CDM) -0.3V ~ +6.0V -0.3V ~ VCC+0.3V +150°C -65°C ~ +150°C -40°C ~ +85°C 29°C /W (QFN) 40.8°C /W (SOP) ±4kV ±1kV Note: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS TA= -40°C ~ +85°C, VCC= 2.7V ~ 5.5V, unless otherwise noted. Typical values are TA= 25°C, VCC= 3.6V. Symbol Parameter Condition VCC Supply voltage IMAX Maximum output current of each VCC= 4.2V, VOUT= 0.8V channel REXT= 2kΩ (Note 1) ICC Min. Typ. 2.7 Max. Unit 5.5 V 38 mA Quiescent power supply current REXT= 3.3kΩ 5.25 mA ISD Shutdown current VSDB= 0V or software shutdown 3.1 μA IOZ Output leakage current VSDB= 0V or software shutdown, VOUT= 5V VEXT 1 Output voltage of R-EXT pin 1.3 μA V Logic Electrical Characteristics (SDA, SCL, SDB) VIL Logic “0” input voltage VCC= 2.7V VIH Logic “1” input voltage VCC= 5.5V IIL Logic “0” input current (Note 2) 5 nA IIH Logic “1” input current (Note 2) 5 nA Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 0.4 1.4 V V 4 IS31FL3218 DIGITAL INPUT SWITCHING CHARACTERISTICS (Note 2) Symbol Parameter Condition Min. Typ. Max. Unit 400 kHz fSCL Serial-Clock frequency tBUF Bus free time between a STOP and a START condition 1.3 μs tHD, STA Hold time (repeated) START condition 0.6 μs tSU, STA Repeated START condition setup time 0.6 μs tSU, STO STOP condition setup time 0.6 μs tHD, DAT Data hold time tSU, DAT Data setup time 100 ns tLOW SCL clock low period 1.3 μs tHIGH SCL clock high period 0.7 μs 0.9 μs tR Rise time of both SDA and SCL signals, receiving (Note 3) 20+0.1Cb 300 ns tF Fall time of both SDA and SCL signals, receiving (Note 3) 20+0.1Cb 300 ns Note 1: The recommended minimum value of REXT is 2kΩ, or it may cause a large current. Note 2: Guaranteed by design. Note 3: Cb= total capacitance of one bus line in pF. ISINK ≤ 6mA. tR and tF measured between 0.3 × VCC and 0.7 × VCC. Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 5 IS31FL3218 FUNCTIONAL BLOCK DIAGRAM VCC IS = 7.8/REXT R_EXT OUT1~OUT18 R_EXT Block SDA SCL I2C PWM Register Comparator SDB POR OSC Counter BG GND Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 6 IS31FL3218 DETAILED DESCRIPTION Then the master sends an SCL pulse. If the IS31FL3218 has received the address correctly, then it holds the SDA line low during the SCL pulse. If the SDA line is not low, then the master should send a “STOP” signal (discussed later) and abort the transfer. I2C INTERFACE The IS31FL3218 uses a serial bus, which conforms to the I2C protocol, to control the chip’s functions with two wires: SCL and SDA. The IS31FL3218’s slave address is “1010 1000”. It only supports write operations. Following acknowledge of IS31FL3218, the register address byte is sent, most significant bit first. IS31FL3218 must generate another acknowledge indicating that the register address has been received. The SCL line is uni-directional. The SDA line is bi-directional (open-collector) with a pull-up resistor (typically 4.7kΩ). The maximum clock frequency specified by the I2C standard is 400kHz. In this discussion, the master is the microcontroller and the slave is the IS31FL3218. Then 8-bit of data byte are sent next, most significant bit first. Each data bit should be valid while the SCL level is stable high. After the data byte is sent, the IS31FL3218 must generate another acknowledge to indicate that the data was received. The timing diagram for the I2C is shown in Figure 2. The SDA is latched in on the stable high level of the SCL. When there is no interface activity, the SDA line should be held high. The “STOP” signal ends the transfer. To signal “STOP”, the SDA signal goes high while the SCL signal is high. The “START” signal is generated by lowering the SDA signal while the SCL signal is high. The start signal will alert all devices attached to the I2C bus to check the incoming address against their own chip address. ADDRESS AUTO INCREMENT To write multiple bytes of data into IS31FL3218, load the address of the data register that the first data byte is intended for. During the IS31FL3218 acknowledge of receiving the data byte, the internal address pointer will increment by one. The next data byte sent to IS31FL3218 will be placed in the new address, and so on. The auto increment of the address will continue as long as data continues to be written to IS31FL3218 (Figure 5). The 8-bit chip address is sent next, most significant bit first. Each address bit must be stable while the SCL level is high. After the last bit of the chip address is sent, the master checks for the IS31FL3218’s acknowledge. The master releases the SDA line high (through a pull-up resistor). Figure 2 Interface timing Figure 3 Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 Bit transfer 7 IS31FL3218 Figure 4 Figure 5 Writing to IS31FL3218 (Typical) Writing to IS31FL3218 (Automatic Address Increment) REGISTERS DEFINITIONS Table 1 Register Function Address 00h Name Function R/W Table Shutdown Register Set software shutdown mode 2 PWM Register 18 channels PWM duty cycle data register 3 13h LED Control Register 1 Channel 1 to 6 enable bit 4 14h LED Control Register 2 Channel 7 to 12 enable bit 15h LED Control Register 3 Channel 13 to 18 enable bit 16h Update Register Load PWM Register and LED Control Register’s data - 17h Reset Register Reset all registers into default - 01h~12h W 0000 0000 6 xxxx xxxx Table 3 01h~12h PWM Register (OUT1~OUT18) Table 2 00h Shutdown Register Bit D7:D1 D0 Bit D7:D0 Name Reserved SSD Name PWM Default 000000 0 Default 0000 0000 The Shutdown Register sets software shutdown mode of IS31FL3218. SSD 0 1 5 Default Software Shutdown Enable Software shutdown mode Normal operation The PWM Registers adjusts LED luminous intensity in 256 steps. The value of a channel’s PWM Register decides the average output current for each output, OUT1~OUT18. The average output current may be computed using the Formula (1): I OUT  I MAX 7   D[n]  2 n 256 n0 (1) Where “n” indicates the bit location in the respective PWM register. Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 8 IS31FL3218 For example: D7:D0 = 10110101, IOUT = IMAX (20+22+24+25+27)/256 See Formula (2) in Page 10 to calculate the IMAX. Table 4 13h LED Control Register 1 (OUT1~OUT6) Bit D7:D6 D5:D0 Name Reserved OUT6:OUT1 Default 00 000000 Table 5 14h LED Control Register 2 (OUT7~OUT12) Bit D7:D6 D5:D0 Name Reserved OUT12:OUT7 Default 00 000000 16h PWM Update Register The data sent to the PWM Registers and the LED Control Registers will be stored in temporary registers. A write operation of “0000 0000” value to the Update Register is required to update the registers (01h~15h). 17h Reset Register Once user writes “0000 0000” data to the Reset Register, IS31FL3218 will reset all registers to default value. On initial power-up, the IS31FL3218 registers are reset to their default values for a blank display. Table 6 15h LED Control Register 3 (OUT13~OUT18) Bit D7:D6 D5:D0 Name Reserved OUT18:OUT13 Default 00 000000 The LED Control Registers store the on or off state of each column LED. OUTx 0 1 LED State LED off LED on Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 9 IS31FL3218 APPLICATION INFORMATION PWM CONTROL 256 The PWM Registers (01h~12h) can modulate LED brightness of 18 channels with 256 steps. For example, if the data in PWM Register is “0000 0100”, then the PWM is the fourth step. 224 PWM Data 192 Writing new data continuously to the registers can modulate the brightness of the LEDs to achieve a breathing effect. 160 128 96 64 REXT 32 The maximum output current of OUT1~OUT18 can be adjusted by the external resistor, REXT, as described in Formula (2). I MAX V  x  EXT REXT 0 0 4 8 Figure 6 The recommended minimum value of REXT is 2kΩ. GAMMA CORRECTION In order to perform a better visual LED breathing effect we recommend using a gamma corrected PWM value to set the LED intensity. This results in a reduced number of steps for the LED intensity setting, but causes the change in intensity to appear more linear to the human eye. Gamma correction, also known as gamma compression or encoding, is used to encode linear luminance to match the non-linear characteristics of display. Since the IS31FL3218 can modulate the brightness of the LEDs with 256 steps, a gamma correction function can be applied when computing each subsequent LED intensity setting such that the changes in brightness matches the human eye's brightness curve. Table 7 32 Gamma Steps With 256 PWM Steps 16 20 24 28 32 Intensity Steps (2) x = 58.5, VOUT = 0.8V, VEXT = 1.3V. 12 Gamma Correction (32 Steps) Choosing more gamma steps provides for a more continuous looking breathing effect. This is useful for very long breathing cycles. The recommended configuration is defined by the breath cycle T. When T=1s, choose 32 gamma steps, when T=2s, choose 64 gamma steps. The user must decide the final number of gamma steps not only by the LED itself, but also based on the visual performance of the finished product. Table 8 64 Gamma Steps With 256 PWM Steps C(0) C(1) C(2) C(3) C(4) C(5) C(6) C(7) 0 1 2 3 4 5 6 7 C(8) C(9) C(10) C(11) C(12) C(13) C(14) C(15) 8 10 12 14 16 18 20 22 C(16) C(17) C(18) C(19) C(20) C(21) C(22) C(23) 24 26 29 32 35 38 41 44 C(24) C(25) C(26) C(27) C(28) C(29) C(30) C(31) 47 50 53 57 61 65 69 73 C(32) C(33) C(34) C(35) C(36) C(37) C(38) C(39) 77 81 85 89 94 99 104 109 C(40) C(41) C(42) C(43) C(44) C(45) C(46) C(47) 114 119 124 129 134 140 146 152 C(48) C(49) C(50) C(51) C(52) C(53) C(54) C(55) C(0) C(1) C(2) C(3) C(4) C(5) C(6) C(7) 0 1 2 4 6 10 13 18 C(8) C(9) C(10) C(11) C(12) C(13) C(14) C(15) 22 28 33 39 46 53 61 69 158 164 170 176 182 188 195 202 C(16) C(17) C(18) C(19) C(20) C(21) C(22) C(23) C(56) C(57) C(58) C(59) C(60) C(61) C(62) C(63) 78 86 96 106 116 126 138 149 209 216 223 230 237 244 251 255 C(24) C(25) C(26) C(27) C(28) C(29) C(30) C(31) 161 173 186 199 212 226 240 255 Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 10 IS31FL3218 256 SHUTDOWN MODE 224 Shutdown mode can either be used as a means of reducing power consumption or generating a flashing display (repeatedly entering and leaving shutdown mode). During shutdown mode all registers retain their data. PWM Data 192 160 128 Software Shutdown 96 64 32 0 0 8 16 24 32 40 48 56 64 Intensity Steps Figure 7 Gamma Correction (64 Steps) Note, the data of 32 gamma steps is the standard value and the data of 64 gamma steps is the recommended value. Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 By setting SSD bit of the Configuration Register (00h) to “0”, the IS31FL3218 will operate in software shutdown mode, wherein they consume only 3.1μA (Typ.) current. When the IS31FL3218 is in software shutdown mode, all current sources are switched off. Hardware Shutdown The chip enters hardware shutdown mode when the SDB pin is pulled low. 11 IS31FL3218 CLASSIFICATION REFLOW PROFILES Profile Feature Pb-Free Assembly Preheat & Soak Temperature min (Tsmin) Temperature max (Tsmax) Time (Tsmin to Tsmax) (ts) 150°C 200°C 60-120 seconds Average ramp-up rate (Tsmax to Tp) 3°C/second max. Liquidous temperature (TL) Time at liquidous (tL) 217°C 60-150 seconds Peak package body temperature (Tp)* Max 260°C Time (tp)** within 5°C of the specified classification temperature (Tc) Max 30 seconds Average ramp-down rate (Tp to Tsmax) 6°C/second max. Time 25°C to peak temperature 8 minutes max. Figure 8 Classification profile Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 12 IS31FL3218 PACKAGE INFORMATION QFN-24 Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 13 IS31FL3218 SOP-24 Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 14 IS31FL3218 RECOMMENDED LAND PATTERN QFN-24 SOP-24 Note: 1. Land pattern complies to IPC-7351. 2. All dimensions in MM. 3. This document (including dimensions, notes & specs) is a recommendation based on typical circuit board manufacturing parameters. Since land pattern design depends on many factors unknown (eg. user’s board manufacturing specs), user must determine suitability for use. Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 15 IS31FL3218 REVISION HISTORY Revision Detail Information Data A Initial release 2012.01.09 B 1. Page 3 ORDERING INFORMATION, SOP-24 QTY changes to 30/Tube 2. Remove TAPE AND REEL INFORMATION 2012.04.08 C Absolute Maximum Ratings: voltage at OUTX change from 5V to -0.3V~VCC+0.3V 2014.09.04 D 1. Update POD 2. Update ESD (HBM) 3. Add land pattern 4. Add θJA 5. Add ESD(CDM) 2016.09.02 E Update θJA for QFN package 2017.06.06 F 1. Add 1000/Reel packing for SOP-24 2. Update RJA and land pattern 2020.10.10 Lumissil Microsystems – www.lumissil.com Rev. F, 10/10/2020 16
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