STV-6101-R01

VM6101 I²C color light sensor Features ■ ■ ■ ■ ■ ■ ■ ■ ■ Pinout VM6101V008 8-lead MLPD Top view SDA 1 SCL 2 INT GND y x RB YG 4-channel Y+RGB photosensor, with integrated infrared filter Wide dynamic range light to frequency converters 2-wire serial interface, I²C and SMBus compatible PWM output for direct LCD backlight control Comparator logic with two programmable thresholds and hysteresis function Power down input 3.0 V to 3.6 V supply range Built-in clock generator, precision voltage and current references Low profile Pb-free package (RoHS compliant) 3 4 8 TEST 7 AMUX 6 5 PD VDD Optical center location: (+70, +35) µm relative to package center. Sensitive area: 220 x 240 µm Description The VM6101 is a high dynamic range 4-channel CMOS photosensor suitable for ambient light sensing as well as color light sensing. Light intensity is converted linearly to a variable frequency signal. The signal period is readable through the two-wire serial interface. A direct PWM output is provided for power saving LCD backlighting applications, where backlighting intensity adapts to the ambient light level. Alternatively, this output can be used as an ambient light level detector output, with two user programmable thresholds. A power down input puts the VM6101 in ultra low power mode. The VM6101 is housed in an compact 8-lead surface mount clear plastic package, compliant to RoHS directive. Applications ■ ■ ■ ■ General purpose color measurement Automatic backlighting control Panel lighting White goods May 2007 Rev 3 1/17 www.st.com 17 Contents VM6101 Contents 1 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 2.2 2.3 2.4 Light measurement channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Comparator logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 PWM generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Two-wire serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4.1 2.4.2 Message types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Alternate slave address selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 4 5 6 7 8 9 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Optical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 VM6101 Pin description 1 Pin description Table 1. Pin 1 2 3 Pin description Name SDA SCL INT Type I/O I/O I/O Description Serial interface data. Requires external pull-up to VDD. Serial interface clock. Requires external pull-up to VDD. Dual function output: - Comparator logic output - PWM generator output Input for serial interface 7-bit address select: - low = address 0x10 (default) - high = address 0x11 Requires external pull-up or pull-down resistor (1 MΩ typically). 4 5 6 GND VDD PD PWR Ground PWR Positive power supply AIN Power down control: - low = force low power standby - high = normal operation Reserved. Do not connect. Reserved. Connect to GND. 7 8 AMUX TEST AIO AIN 2 Functional description Figure 1. Functional block diagram Y R G B Light to Frequency Converter (x4) Power-on Reset 27-bit Counter Register Bank Serial Interface SCL SDA (x4) PWM Generator 3.6 MHz Oscillator Comparator Logic Pin Function Mux PD VDD GND INT 3/17 Functional description VM6101 2.1 Light measurement channels The VM6101 has four independent wide dynamic range photosensors and current-tofrequency converters. Each channel produces a digital output with a frequency proportional to the incoming light level on the photosensor. By construction, the device ensures automatic exposure control. Figure 2. Light-to-Frequency converter (L2F) The output period is measured using a 27-bit free-running counter and the internal 3.6 MHz oscillator clock; counter values are then read through the serial interface. The typical light response is shown in Figure 3. below, obtained using a CIE D65 white point light source (~ daylight illumination) and no light diffuser. Figure 3. Light response 100000001.0E+07 B G R 10000001.0E+06 Y 1000001.0E+05 Output (count) B G R Y Output (count ) 100001.0E+04 10001.0E+03 1 1 10 10 100 100 1000 1000 Illum inance Lum inance (lx) (lx) 4/17 VM6101 The light response can be approximated by: ● ● ● ● Functional description Y channel: R channel: G channel: B channel: EvY = 1.58e6 x count -0.960 EvR = 3.34e6 x count -0.902 EvG = 4.92e6 x count -0.944 EvB = 8.03e6 x count -0.973 The response time is: t = count / fOSC + serial interface read time (about 200 µs) Example: t = 9.3 ms for 300 lx. Each channel provides three status flags and a counter value: ● ● ● ● RESET: This flag is set upon reset or power-down resume. The counter value is invalid and should be discarded. This flag is cleared after a status read operation. OVERFLOW: at least one counter overflow occurred: the counter value is invalid and should be discarded. This flag is cleared when a new valid counter value is available. READY: a new counter value is available. This flag is cleared immediately after the status register read. CNT: a 27-bit counter value, mapped in 4 consecutive bytes, MSB first and right justified. Channel readout must always start by reading the corresponding status register. The suggested read operation is a 5-byte read operation starting at the status register address. Refer to Chapter 4: Register description for details. 2.2 Comparator logic This function compares the light level (i.e. channel counter CNT) with two programmable thresholds (TH_LO and TH_HI) and drives the INT pin accordingly. The following table shows available configurations using TH_CFG register setup: 5/17 Functional description Table 2. EN_HI: EN_LO 00 01 0 POL_LO xor (CNT < TH_LO) 1 0 TH_LO TH_HI VM6101 Threshold module configurations (TH_CFG register usage) INT output 0 INT versus CNT (assumes INT_POL = 0) (POL_LO = 0) 10 POL_HI xor (CNT < TH_HI) 1 0 TH_LO TH_HI (POL_HI = 0) 11 HYST = 0: (POL_LO xor (CNT < TH_LO)) and (POL_HI xor (CNT < TH_HI)) 1 0 TH_LO TH_HI (POL_LO = 1, POL_HI = 0) HYST = 1: see diagram 1 0 TH_LO TH_HI (POL_LO = 1, POL_HI = 0) Notes 1. Upon reset, the comparator logic is enabled (EN_HI:EN_LO = 01) with POL_LO = 1 and TH_LO = 0x0008. The INT pin is high when Y channel count > 8. 2. Assuming CONTROL= 0x04, i.e. comparator mode using Y channel count (default value for CONTROL register). 3. Ensure TH_LO < TH_HI otherwise unpredictable results may occur. 2.3 PWM generator The pulse width modulator (PWM) generates a signal which may be used to directly control LCD backlight driver ICs according to ambient light level. There are three registers to control the PWM generator operation: ● ● ● ● PWM_FREQ register bits [4:0] sets the period of the PWM signal. This is adjustable from 12Hz to 400kHz. PWM_SENS register bits [4:0] sets the sensitivity of the PWM signal to light level. CONTROL register bit 2 = 0 to select PWM output at INT pin. CONTROL register bit 3 controls the polarity of the PWM output (default = 0). For more details please refer to Chapter 4: Register description. The curve below shows typical PWM output duty cycle (default polarity) as a function of illumination, with sensitivity setting ranging from 9 to 18, corresponding to typical use cases (10 to 10000 lx illumination). 6/17 VM6101 Figure 4. PWM duty cycle versus illumination 1.2 1.2 1.0 1.0 0.8 PWM_SENS = 9 0.8 PWM_SENS = 9 0.6 0.6 0.4 0.4 0.2 0.2 0.0 0.0 -0.2 -0.2 1E+00 10E+00 1E+00 10E+00 Functional description Duty cycle Duty cycle PWM_SENS = 18 PWM_SENS = 18 100E+00 1E+03 100E+00 Illuminance1E+03 (lx) Illumination (lx) 10E+03 10E+03 100E+03 100E+03 2.4 Two-wire serial interface The VM6101 two-wire serial interface supports the following features: ● ● ● ● ● Standard-mode (100 kHz) I²C slave controller supporting 8-bit addressing (7-bit address = 0x10 or 0010 000). SMBus compliant. Data and clock deglitching filters (double sampling) 8-bit index, i.e. 256 on-chip register address space Multiple read or write with index auto-increment Alternate address (0x11) selectable 2.4.1 Message types The VM6101 registers are accessed by serial bus byte-oriented transactions. The following message types are supported: ● ● ● Master write: [...] Master read: [...] Combined format: [...] where: S = start, Sr = repeated start, P = stop, A= acknowledge, nA = negative acknowledge addr = 7-bit slave address, w = write bit (0), r = read bit (1), index = 8-bit register address, data = 8-bit register data, [] = optional. 7/17 Application information VM6101 2.4.2 Alternate slave address selection After power-on or after resuming from power-down, the 7-bit slave address is 0x10. If another slave device shares the same address, it is possible to remap the VM6101 to address 0x11 by performing the following operations: 1. 2. 3. Connect the INT pin to a pull-up resistor to VDD (1 MΩ typ.). After power-on or power-down resume, issue a write command to set the ADDR_SEL bit of CONTROL register (i.e. write 0x10 at register address 0x02, slave address 0x10). At this time, the VM6101 samples the INT pin and sets its slave address accordingly: INT sampled low: 7-bit address = 0x10, INT sampled high: 7-bit address = 0x11. Two VM6101 can thus coexist on the same bus; one should have its INT pin pulled low, the other one should have its INT pin pulled high (see Figure 5.). 3 Application information Figure 5. Application diagram +3.3V +3.3V NC VDD AMUX TEST GND SCL SDA INT PD 1M Rb Rb VM6101 Host Microcontroller SCL SDA GPIO0 GPIO1 GPIO2 GPIO3 I²C 7-bit addr = 0x10 +3.3V NC VM6101 VDD AMUX TEST GND SCL SDA INT PD 1M Optional +3.3V I²C 7-bit addr = 0x11 Note: Rb value depends on bus capacitive load 8/17 VM6101 Register description 4 Note: Register description RO = Read Only; RW = Read/Write. Reserved bits must be written with 0s and return 0 upon read; Reserved bytes must not be accessed otherwise unpredictable results my occur. Table 3. Addr. 0x00 0x00 0x01 0x02 Register description Bits [3:0] [7:4] [7:0] [6:0] [1:0] Def. 1 0 0x04 0x04 0 Name REVISION MASK N_PIXEL CONTROL CHSEL Chip revision (RO). Mask code (RO). (RO) Control register (RW) Channel select for comparator and PWM logic: 0: Y 1: R 2: G 3: B INT pin function select: 0: PWM generator output 1: Comparator logic output PWM polarity: 0: Normal (Thin pulse for low values, Wide pulses for high values) 1: Inverted. Address Select: when written with ‘1’, the INT pin goes high impedance; after a duration T (defined below), the INT pin is sampled and returns to low impedance. The device slave address is set accordingly: INT sampled low: address = 0x20 INT sampled high: address = 0x22. Address select sampling window duration: 0: T = 160 µs (default) 1: T = 80 µs 2: T = 40 µs 3: T = 20 us This duration allows for INT pin pull-up rise time. Reserved Reserved (RO). Y_STATUS Y-channel status register (RO). Reading this register will cause Y_CNT to be transferred to serial interface buffer. 5 MSBs are read as zeros. This bit is set after reset. Cleared after first read of STATUS register. This bit is set upon counter overflow: current counter values are invalid. When set, indicates that a new count value is available in the 4 registers here below. Description 2 1 INT_FSEL 3 0 PWM_POL 4 0 ADDR_SEL [6:5] 0 ADDR_SELW 7 0x03 0x04 [7:0] [2:0] 0 0 0x01 0 1 2 1 0 0 RESET OVERFLOW READY 9/17 Register description Table 3. Addr. 0x05 0x06 0x07 0x08 0x09 0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 VM6101 Register description (continued) Bits [2:0] [7:0] [7:0] [7:0] [7:0] [2:0] [7:0] [7:0] [7:0] [7:0] [2:0] [7:0] [7:0] [7:0] [7:0] [2:0] [7:0] [7:0] [7:0] [5:0] 0 1 Def. 0 0 0 0 0x01 0x00 0x00 0x00 0x00 0x01 0x00 0x00 0x00 0x00 0x01 0x00 0x00 0x00 0x00 0x03 1 1 0 0 0 0 0x00 0x00 0x00 0x08 0x00 0x00 0x00 0 Name Y_CNT3 Y_CNT2 Y_CNT1 Y_CNT0 R_STATUS R_CNT3 R_CNT2 R_CNT1 R_CNT0 G_STATUS G_CNT3 G_CNT2 G_CNT1 G_CNT0 B_STATUS B_CNT3 B_CNT2 B_CNT1 B_CNT0 TH_CFG EN_LO POL_LO EN_HI POL_HI INT_POL HYST TH_LO3 TH_LO2 TH_LO1 TH_LO0 TH_HI3 TH_HI2 TH_HI1 TH_HI0 Description Y channel count bits [26:24] (RO). 5 MSBs are read as zeros. Y channel count bits [23:16] (RO) Y channel count bits [15:8] (RO) Y channel count bits [7:0] (RO) R channel status register (RO). Refer to Y Channel for description. R channel count bits [26:24] (RO). 5 MSBs are read as zeros. R channel count bits [23:16] (RO) R channel count bits [15:8] (RO) R channel count bits [7:0] (RO) G channel status register (RO). Refer to Y Channel for description. G channel count bits [26:24] (RO). 5 MSBs are read as zeros. G channel count bits [23:16] (RO) G channel count bits [15:8] (RO) G channel count bits [7:0] (RO) B channel status register (RO). Refer to Y Channel for description. B channel count bits [26:24] (RO). 5 MSBs are read as zeros. B channel count bits [23:16] (RO) B channel count bits [15:8] (RO) B channel count bits [7:0] (RO) Comparator logic configuration (RW). 2 MSBs are reserved. Refer to Section 2.2: Comparator logic for programming details. Enable low threshold comparator (1 = enable, 0 = disable) Low threshold comparator output polarity Enable high threshold comparator (1 = enable, 0 = disable) High threshold comparator output polarity INT pin output polarity Enable hysteresis function Low threshold bits [26:24] (RW). 5 MSBs are read as zeros. Low threshold bits [23:16] (RW) Low threshold bits [15:8] (RW) Low threshold bits [7:0] (RW) High threshold bits [26:24] (RW). 5 MSBs are read as zeros. High threshold bits [23:16] (RW) High threshold bits [15:8] (RW) High threshold bits [7:0] (RW) 0x18 2 3 4 5 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f 0x20 [2:0] [7:0] [7:0] [7:0] [2:0] [7:0] [7:0] [7:0] 10/17 VM6101 Table 3. Addr. 0x21 Register description Register description (continued) Bits [3:0] Def. 0x00 Name PWM_FREQ Description PWM output frequency (RW)(4 MSBs are reserved): n = 0 to 15 fPWM = fOSC * 2n-18, where fOSC = 3.6 MHz. PWM sensitivity (RW)(3 MSBs are reserved): n = 0 to 26 0 = high sensitivity, 26 = low sensitivity. Practical values lie between 9 and 18. Refer to Figure 4: PWM duty cycle versus illumination for typical behavior. Reserved. 0x22 [4:0] 0x00 PWM_SENS 0x22 ... 0x27 0x28 0x29 0x2A ... 0xFF [7:0] [7:0] [7:0] [7:0] 0x04 0x00 TEST_MOD TEST_SEL Reserved (RW). Reserved (RW). Reserved. 11/17 Optical characteristics VM6101 5 Table 4. Symbol E Ev Optical characteristics Optical characteristics (1) Parameter Irradiance range Illuminance range Conditions Min 0.0001 0.03 Typ Max 800 170k Unit Wm-2 lx 1. Using typical operating conditions: TA = 25 °C, VDD = 3.3 V Figure 6. Spectral response 1.0 Red 1.2 Normalized response 1.0 0.8 0.6 0.4 0.2 0.0 Normalized Sensitivity 0.8 Blue Angular response Green Y 0.6 0.4 0.2 -90 0.0 400 -60 500 600 700 800 -30 0 Wavelength (nm ) 60 30 Incident light angle (degrees) 900 90 1000 Figure 7. 1.2 Angular response Figure 8. Relative output versus temperature 1.100 1.2 G 1.3 1.0 R 1.3 1.050 B 1.2 0.8 1.2 Y 1.1 1.1 0.6 1.000 1.0 1.0 0.4 0.9 0.9 0.950 0.8 0.2 0.8 0.7 0.0 0.7 0 10 20 30 40 50 60 70 80 -10 0.900 -90 -60 10 20 30 4030 60 -10-10 0 -30 20 0 30 40 50 60 90 80 0 50 60 7070 80 10 Temperature (°C) Temperature (°C) Temperature (°C) Normalized sensitivity 1.0 0.8 0.6 0.4 0.2 0.0 -90 -60 -30 0 30 60 90 Incident light angle (degrees) 12/17 Normalized response Normalized response Normalized sensitivity Normalized sensitivity VM6101 Electrical characteristics 6 Table 5. Symbol VDD VIN TSTG TL ESDHBM ESDMM ESDCDM Electrical characteristics Absolute maximum ratings (Note 1, Note 2) Parameter Supply voltage DC input voltage, all I/O pins Storage temperature Solder reflow peak temperature, JEDEC J STD-020 Human body model ESD rating, all pins, JESD22-A114-B Machine model ESD rating, all pins, JESD22-A115-B Charged device model ESD rating, all pins, JESD22-C101-C Min -0.5 -0.5 -40 Max 3.7 VDD + 0.5 85 245 2 200 500 Unit V V °C °C kV V V Table 6. Symbol TA VDD VIL Recommended operating conditions Parameter Operating temperature Supply voltage Input low voltage (SCL, SDA) Input low voltage (PD) Min 0 3.0 0 0 0.7 VDD 2.0 4 4 Max 70 3.6 0.3 VDD 0.8 VDD Unit °C V V V V V mA mA VIH Input high voltage (SCL, SDA) Input high voltage (PD) IOL IOH Output low current Output high current Table 7. Symbol VOL VOH IIL IDDPD IDD DC electrical characteristics (Note 3) Parameter Output low voltage (SDA, INT) Output high voltage (INT) Input leakage current Supply current, power-down Supply current, active Conditions IOL = max, VDD = min IOH = max, VDD = min All I/O pins PD low (Note 4) PD high (Note 4) 2.4 -1 +1 1.0 1.1 Min Max 0.4 Unit V V µA µA mA Table 8. Symbol fOSC AC electrical characteristics (Note 3) Parameter Internal oscillator frequency Conditions Min Typ 3.6 Max Unit MHz 13/17 Electrical characteristics Table 9. Symbol fSCL tLOW tHIGH tSU;STA tHD;STA tSU;DAT tHD;DAT tSU;STO tBUF tR tF Cb SCL clock frequency SCL clock low period SCL clock high period (Repeated) START condition setup time (Repeated) START condition hold time Data setup time Data hold time STOP condition setup time Bus free condition between START and STOP conditions Rise time of both SDA and SCL signals Fall time of both SDA and SCL signals Capacitive load for each bus line VM6101 Serial interface timing (Note 3) Parameter Min 0 4.7 4.0 4.7 4.0 250 300 4.0 4.7 300 300 400 Max 100 Unit kHz µs µs µs µs ns ns ns µs ns ns pF Figure 9. Serial interface timing waveforms Stop SDA Start Start Stop tBUF SCL tLOW tR tF tHD;STA tHD;STA tHD;DAT tHIGH tSU;DAT tSU;STA tSU;STO Note: 1 Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Unless otherwise specified, all voltages are referenced to ground. Over recommended operating conditions, unless otherwise specified. Using typical operating conditions: TA = 25 °C, VDD = 3.3 V 2 3 4 14/17 VM6101 Mechanical information 7 Mechanical information Figure 10. 8-lead MLPD package outline Symbol A A3 b D D2 E E2 e L 0.55 0.25 2.90 2.20 2.90 1.00 Min 0.65 Typ 0.7 0.20 0.30 3.00 2.35 3.00 1.15 0.65 2.20 0.60 0.35 3.10 2.45 3.10 1.25 Max 0.75 0.65 0.7 2.35 0.65 1.00 1.15 All dimensions in millimeters 0.55 0.60 Figure 11. Recommended PCB layout 15/17 Ordering information VM6101 8 Ordering information Table 10. Order codes Part number VM6101V008 VM6101V008/TR STV-6101-R01 Description 8-lead MLPD 3 x 3 x 0.7 mm, RoHS compliant, tray packing. 8-lead MLPD 3 x 3 x 0.7 mm, RoHS compliant, 13” tape and reel, 5000 parts/reel. VM6101 evaluation board 9 Revision history Table 11. Date 05-Jun-2006 14-Dec-2006 27-Apr-2007 Document revision history Revision 1 2 3 Initial release Global update Updated Chapter 6: Electrical characteristics and Chapter 4: Register description Changes 16/17 VM6101 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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