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MAX44007EDT+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX44007EDT+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 21 page Low-Power Digital Ambient Light Sensor with Enhanced Sensitivity 10 Bits in Lux High-Byte register 0x03 give the 4 bits of exponent E3:E0 and 4 most significant bits of the mantissa byte M7:M4, and represent the lux reading of ambient light. The remaining 4 bits of the mantissa byte M3:M0 are in the Lux Low-Byte register 0x04 and enhance resolution of the lux reading from the IC. Exponent (E[3:0]): Exponent bits of the lux reading (0000 to 1110). Note: A reading of 1111 represents an overrange condition. Mantissa (M[7:4]): Four most significant bits of mantissa byte of the lux reading (0000 to 1111). Lux = 2(exponent) x mantissa x 0.4 Exponent = 8xE3 + 4xE2 + 2xE1 + E0 Mantissa = 8xM7 + 4xM6 + 2xM5 + M4 A code of 0000 0001 calculates to be 0.4 lux. A code of 1110 1111 calculates to be 98,304 lux. A code of 1110 1110 calculates to be 91,751 lux. Update of the contents of this register is internally disabled during I2C read operations to ensure proper data transfer between internal ADC and I2C registers. Update of I2C registers is resumed when the master sends a STOP command. If user wants to read both the Lux High-Byte register 0x03 and Lux Low-Byte register 0x04, then the master should not send a STOP command between the reads of the two registers. Instead a REPEATED START command should be used. This ensures accurate data is obtained from the I2C registers (by disabling internal updates during the read process). Integration Timer Bits (TIM[2:0]) The TIM[2:0] bits can be used to program the signal integration time. In automatic mode (MANUAL = 0), integration time is automatically selected by the on-chip algorithm to be either 100ms/200ms/400ms/800ms. In manual mode, integration time can be varied by the user all the way from 6.25ms to 800ms. See Table 7. Lux High-Byte Register 0x03 Table 7. Integration Time TIM[2:0] INTREGRATION TIME (ms) COMMENTS 000 800 This is a preferred mode for boosting low-light sensitivity. 001 400 — 010 200 — 011 100 This is a preferred mode for high-brightness applications. 100 50 Manual mode only. 101 25 Manual mode only. 110 12.5 Manual mode only. 111 6.25 Manual mode only. BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 REGISTER ADDRESS E3 E2 E1 E0 M7 M6 M5 M4 0x03 |
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