ADPD4200 datasheet(37/93 Pages) AD

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Data Sheet

ADPD4200

APPLICATIONS INFORMATION

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Rev. 0 | 37 of 93

Table 22. Relevant Settings for Digital Integration Modes

Group

Time Slot A Register Address1

Bit Field Name

Description

Signal Path Setup 0x0100, Bits[13:12]

SAMPLE_TYPE_x

Set to 0x1 for one-region digital integration mode. Set to 0x2 for two-region digital

integration mode.

0x0101, Bits[8:0]

AFE_PATH_CFG_x

Set to 0x0E6 for TIA, integrator, and ADC. Bypass BPF. Integrator is automatically

configured as a buffer when one-region or two-region digital integration mode is

selected.

0x0102, Bits[15:12], 0x0102, Bits[3:0]

INPxx_x

Enable desired inputs.

0x0103, Bits[14:12]

PRECON_x

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

0x0103, Bits[7:6], 0x0103, Bits[1:0]

VCx_SEL_x

Set to 0x2 to set ~250 mV reverse bias across photodiode.

0x0104, Bits[5:0]

TIA_GAIN_CHx_x

Select TIA gain.

0x0104, Bits[9:8]

AFE_TRIM_VREF_x

Set to 0x3 to set TIA_VREF = 1.265 V.

Timing

0x0107, Bits[15:8]

NUM_INT_x

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

0x0107, Bits[7:0]

NUM_REPEAT_x

Number of sequence repeats.

0x0108, Bits[9:0]

MIN_PERIOD_x

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

mode.

0x0113, Bits[8:0]

LIT_OFFSET_x

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

0x0114, Bits[6:0]

DARK1_OFFSET_x

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

0x0114, Bits[15:7]

DARK2_OFFSET_x

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

two-region digital integration mode.

LED Settings

0x0105, Bit 15, 0x0105, Bit 7, 0x0106,

Bit 15, 0x0106, Bit 7

LED_DRIVESIDEx_x

Select LED for time slot used.

0x0105, Bits[14:8], 0x0105, Bits[6:0],

0x0106, Bits[14:8], 0x0106, Bits[6:0]

LED_CURRENTx_x

Set LED current for selected LED.

0x0109, Bits[7:0]

LED_OFFSET_x

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

0x0109, Bits[15:8]

LED_WIDTH_x

Sets width of LED pulse in 1 μs increments.

1 This is the Time Slot A register address. Add 0x020 for the identical register address for each subsequent time slot. For example, Register 0x0100 is the location

for SAMPLE_TYPE_A. For Time Slot B, this register is at Address 0x0120. For Time Slot C, this register is at Address 0x0140. For Time Slot D, this register is at

Address 0x0160, and so on.

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