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ISL29120 Datasheet(PDF) 5 Page - Renesas Technology Corp |
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ISL29120 Datasheet(HTML) 5 Page - Renesas Technology Corp |
5 / 8 page ISL29120 FN8314 Rev 0.00 Page 5 of 8 May 29, 2012 Register Set There are eight registers that are available in the ISL29120. Table 1 summarizes their functions. Command Register I 0x00 The first command register has the following functions: Operation Mode: Bits[7:5]. These three bits determine the operation mode of the device. Interrupt flag: Bit[2]. This is the interrupt status bit. The bit is set high when the interrupt thresholds have been triggered. Once triggered, the INT pin stays low and the status bit stays high. Both the interrupt pin and the status bit are cleared at the end of Command Register I read. Interrupt persist: Bits[1:0]. The interrupt pin and the interrupt flag are triggered/set when the data sensor reading is out of the interrupt threshold window after m consecutive data conversion cycles. The interrupt persist bits determine m. Command Register II 0x01 The second command register has the following functions: Resolution: Bits[3:2] determine the ADC’s resolution and the integration time. The integration time is the period the device’s analog-to-digital (A/D) converter samples the photodiode current for a measurement. 1. Range 0x01[0]: The Full Scale Optical Range (FSOR). Optical sensitivity for the ‘Low’ range is 4.75 times the optical sensitivity in ‘High’ range. TABLE 1. REGISTER SET ADDR REG NAME BIT 76 5 4 3 2 1 0 DEFAULT 00h COMMANDI OP2 OP1 OP0 0 0 IFLG PRST1 PRST0 00h 01h COMMANDII 0 0 0 0 RES1 RES0 0 RANGE 00h 02h DATALSB D7 D6 D5 D4 D3 D2 D1 D0 00h 03h DATAMSB D15 D14 D13 D12 D11 D10 D9 D8 00h 04h INT_LT_LSB TL7 TL6 TL5 TL4 TL3 TL2 TL1 TL0 00h 05h INT_LT_MSB TL15 TL14 TL13 TL12 TL11 TL10 TL9 TL8 00h 06h INT_HT_LSB TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0 FFh 07h INT_HT_MSB TH15 TH14 TH13 TH12 TH11 TH10 TH9 TH8 FFh TABLE 2. OPERATION MODE 0x00[7:5] OPERATION 000 Power-down 001 Red Sensor once 010 Blue Sensor once 011 Green Sensor once 100 Reserved 101 Red Sensor continuous 110 Blue Sensor continuous 111 Green Sensor continuous TABLE 3. INTERRUPT FLAG 0x00[2] OPERATION 0 No Interrupt event 1 Interrupt event triggered TABLE 4. INTERRUPT PERSISTENCE 0x00[1:0] NUMBER OF DATA CONVERSION CYCLES 00 1 01 4 10 8 11 16 TABLE 5. ADC RESOLUTION DATA WIDTH 0x01[3:2] INTEGRATION TIME (ms) RESOLUTION 00 90 16 Bits 01 5.6 12 Bits 10 0.35 8 Bits 11 0.022 4 Bits TABLE 6. RANGE 0x01[0] FSR 0Low 1High |
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