ADPD7008 datasheet(20/71 Pages) AD

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Data Sheet

ADPD7008

APPLICATIONS INFORMATION

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Rev. 0 | 20 of 71

Figure 22. One-Region Digital Integration Mode Timing Diagram

Figure 23. Two-Region Digital Integration Mode Timing Diagram

Table 13. Relevant Settings for Digital Integration Modes, for Example, for Time Slot A

Group

Time Slot A Register Address

Bit Field Name

Description

Signal Path Setup 0x0120, Bits[13:11]

SAMPLE_TYPE_A

Set to 0x2 for one-region digital integration mode. Set to 0x3 for two-region digital

integration mode.

0x0121, Bits[6:0]

AFE_PATH_CFG_A

Set to 0x28 for TIA, buffer, and ADC. Use 1x TIA configuration.

0x0122, Bits[7:0]

INPxx_A

Enable desired inputs.

0x0123, Bits[14:12]

PRECON_A

Set to 0x5 to precondition anode of photodiode to TIA_VREF.

0x0123, Bits[1:0]

VC1_SELECT_A

Set to 0x2 to set ~215 mV reverse bias across photodiode.

0x0124, Bits[5:0]

TIA_GAIN_CHx_A

Select TIA gain.

0x0124, Bits[9:8]

AFE_TRIM_VREF_A

Set to 0x2 to set TIA_VREF = 0.8855 V.

0x0124, Bits[12:11]

AFE_BUFFER_GAIN_A

Buffer gain selection. Set to 2 to select buffer gain = 2.

0x125, Bits[13:12]

AFE_BUFFER_CAP_A

Buffer feedback capacitor selection. Set to 0x1 to 12.6 pF.

Timing

0x012A, Bits[15:8]

NUM_INT_A

Set to the number of desired ADC conversions in the dark and lit regions.

0x012A, Bits[7:0]

NUM_REPEAT_A

Number of sequence repeats.

0x012B, Bits[9:0]

MIN_PERIOD_A

Set the period. Automatic period calculation is not supported in digital integration

mode.

0x0138, Bits[8:0]

LIT_OFFSET_A

Set to the time of the first ADC conversion in the lit region.

0x0139, Bits[6:0]

DARK1_OFFSET_A

Set to the time of the first ADC conversion in the Dark 1 region.

0x0139, Bits[15:7]

DARK2_OFFSET_A

Set to the time of the first ADC conversion in the Dark 2 region. Only used in

two-region digital integration mode.

LED Settings

0x0129, Bits[1:0]

LED_MODEx_A

Select LED mode.

0x0129, Bits[7:4]

LED_DRIVESIDEx_A

Select LED for time slot used.

0x0128, Bits[14:8], Bits[6:0]

LED_CURRENTx_A

Set LED current for selected LED.

0x012C, Bits[7:0]

LED_OFFSET_A

Sets start time of first LED pulse in 1 μs increments.

0x012C, Bits[15:8]

LED_WIDTH_A

Sets width of LED pulse in 1 μs increments.

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