ADPD6000 datasheet(28/89 Pages) AD

28 / 89 page

Data Sheet

ADPD6000

APPLICATIONS INFORMATION

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Rev. 0 | 28 of 89

Figure 41. One-Region Digital Integration Mode Timing Diagram

Figure 42. Two-Region Digital Integration Mode Timing Diagram

Table 14. Relevant Settings for Digital Integration Modes

Group

Time Slot A Register Address

Bit Field Name

Description

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

SAMPLE_TYPE_x

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_x

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

0x0122, Bits[7:0]

INPxx_x

Enable desired inputs.

0x0123, Bits[14:12]

PRECON_x

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

0x0123, Bits[7:6], Bits[1:0]

VCx_SELECT_x

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

0x0124, Bits[5:0]

TIA_GAIN_CHx_x

Select TIA gain.

0x0124, Bits[9:8]

AFE_TRIM_VREF_x

Set to 0x2 to set TIA_VREF = 0.8855 V.

0x0124, Bits[12:11], Bits[14:13]

CH1_TRIM_INT_x

Set to 0x3 to set buffer gain = 2.

0x125, Bits[13:12]

CH1_TRIM_INT_CAP_x

Set to 0x1 to 12.6 pF

Timing

0x012A, Bits[15:8]

NUM_INT_x

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

0x012A, Bits[7:0]

NUM_REPEAT_x

Number of sequence repeats.

0x012B, Bits[9:0]

MIN_PERIOD_x

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

mode.

0x0138, Bits[8:0]

LIT_OFFSET_x

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

0x0139, Bits[6:0]

DARK1_OFFSET_x

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

0x0139, 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

0x0129, Bits[1:0]

LED_MODEx_x

Select LED mode.

0x0128, Bit 15 and Bit 7

LED_DRIVESIDEx_x

Select LED for time slot used.

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

LED_CURRENTx_x

Set LED current for selected LED.

0x012C, Bits[7:0]

LED_OFFSET_x

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

0x012C, Bits[15:8]

LED_WIDTH_x

Sets width of LED pulse in 1 μs increments.

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