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MAX44009
Industry’s Lowest-Power
Ambient Light Sensor with ADC
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.
Table 7. Integration Time
TIM[2:0]
000
001
010
011
100
101
110
111
INTEGRATION
TIME (ms)
800
400
200
100
50
25
12.5
6.25
COMMENTS
This is a preferred mode for boosting low-light sensitivity.
—
—
This is a preferred mode for high-brightness applications.
Manual mode only.
Manual mode only.
Manual mode only.
Manual mode only.
Lux High-Byte Register 0x03
BIT 7
E3
BIT 6
E2
BIT 5
E1
BIT 4
E0
BIT 3
M7
BIT 2
M6
BIT 1
M5
BIT 0
M4
REGISTER
ADDRESS
0x03
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 0.72
Exponent = 8xE3 + 4xE2 + 2xE1 + E0
Mantissa = 8xM7 + 4xM6 + 2xM5 + M4
A code of 0000 0001 calculates to be 0.72 lux.
A code of 1110 1111 calculates to be 176,947 lux.
A code of 1110 1110 calculates to be 165,151 lux.
Update of the contents of this register is internally disabled during I 2 C read operations to ensure proper data transfer
between internal ADC and I 2 C registers. Update of I 2 C 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 I 2 C registers (by disabling internal updates during the read process).
Maxim Integrated
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