전자부품 데이터시트 검색엔진 |
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ISL29015IROZ-T7 데이터시트(PDF) 6 Page - Intersil Corporation |
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ISL29015IROZ-T7 데이터시트(HTML) 6 Page - Intersil Corporation |
6 / 13 page 6 FN6522.0 October 31, 2008 Register Set There are four registers that are available in the ISL29015. Table 1 summarizes their functions. Command Register I 00(hex) The first command register has the following functions: 1. Operation Mode: Bits 7, 6, and 5.These three bits determines the operation mode of the device. 2. Bit 4 to 0 has been reserved to 0. Command Register II 01(hex) The second command register has the following functions: 1. Amplitude of IR driver current: Bits 7 and 6. This device provides current source to drive an external IR LED. The drive capability can be programmed through Bits 7 and 6. For example, the device sources 100mA out of the IRDR pin if Bits 7 and 6 are 0 during proximity sensing. 2. Modulation Frequency: Bits 5 and 4. These two bits set the IR LED driver’s modulation frequency. 3. Resolution: Bits 3 and 2. Bits 3 and 2 determine the ADC’s resolution and the number of clock cycles per conversion in Internal Timing Mode. Changing the number of clock cycles does more than just change the resolution of the device. It also changes the integration time, which is the period the device’s analog-to-digital FIGURE 2. I2C WRITE TIMING DIAGRAM SAMPLE START W A A A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A B7 B6 B5 B4 B3 B2 B1 B0 A A 1 2 615 948 STOP SDA DRIVEN BY MASTER FUNCTIONS REGISTER ADDRESS DEVICE ADDRESS SDA DRIVEN BY MASTER SDA DRIVEN BY MASTER I2C DATA I2C SDA IN I2C SDA OUT I2C CLK IN AA 34 5 7 8 9 2 3 4 6 7 8 1 2 3 5 67 9 A TABLE 1. REGISTER SET ADDR REG NAME BIT 7 6 5 4 3 2 1 0 DEFAULT 00h COMMANDI OP2 OP1 OP0 0 0 0 0 0 00h 01h COMMANDII IS1 IS0 FREQ1 FREQ0 RES1 RES0 RANGE1 RANGE0 00h 02h DATALSB D7 D6 D5 D4 D3 D2 D1 D0 00h 03h DATAMSB D15 D14 D13 D12 D11 D10 D9 D8 00h TABLE 2. OPERATION MODE BITS 7 TO 5 OPERATION 000 Power-down the device 001 ALS once 010 IR once 011 Proximity once 100 Reserved 101 ALS continuous 110 IR continuous 111 Proximity continuous TABLE 3. CURRENT SOURCE CAPABILITY AT IRDR PIN BITS 7: 6 IRDR PIN SOURCE CURRENT 00 100mA IR LED driver 01 50mA IR LED driver 10 25mA IR LED driver 11 12.5mA IR LED driver TABLE 4. MODULATION FREQUENCY BITS 5:4 MODULATION FREQUENCY (kHz) 00 DC 01 N/A 10 N/A 11 360 ISL29015 |
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