ADPD103BCPZ datasheet(42/53 Pages) AD

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Data Sheet

ADPD103

Rev. B | Page 41 of 52

AFE CONFIGURATION REGISTERS

Table 21. AFE Global Configuration Registers

Address

Data Bit

Default

Value

Access

Name

Description

0x3C

[15:14]

0x0

R/W

RESERVED

Write 0x0.

[13:11]

0x6

R/W

RESERVED

Write 0x6.

0x0

R/W

Reserved

Write 0x0.

0x0

R/W

V_CATHODE

0x0: 1.3 V (identical to anode voltage); recommended

setting.

0x1: 1.8 V (reverse bias photodiode by 550 mV. This

setting may add noise).

[8:3]

0x0

R/W

AFE_POWERDOWN

AFE channels power-down select.

0x38: powers down AFE Channel 2, Channel 3, and

Channel 4.

0x0: keeps all channels on.

[2:0]

0x6

R/W

Reserved

Write 0x6.

0x54

0x0

R/W

SLOTB_SINGLE_CH_DIG_INT

0: In Time Slot B, use all four photodiode channels in

parallel for digital integration (default setting for highest

dynamic range)

1: In Time Slot B, use only Channel 1 for digital

integration. This limits connection to PD1 or PD5.

0x0

R/W

SLOTA_SINGLE_CH_DIG_INT

0: In Time Slot A, use all four photodiode channels in

parallel for digital integration (default setting for highest

dynamic range)

1: In Time Slot A, use only Channel 1 for digital

integration. This limits connection to PD1 or PD5.

[13:12]

0x0

R/W

SLEEP_V_CATHODE

If Bit 7 = 1; this setting is applied to the cathode voltage

while the device is in sleep mode. The anode voltage is

always set to the cathode voltage in sleep mode.

0x0: VDD (1.8 V).

0x1: 1.3 V.

0x2: 1.55 V.

0x3: 0.0 V.

[11:10]

0x0

R/W

SLOTB_V_CATHODE

If Bit 7 = 1; this setting is applied to the cathode voltage

while the device is in Time Slot B operation. The anode

voltage is always 1.3 V in Time Slot B mode.

0x0: VDD (1.8 V).

0x1: 1.3 V.

0x2: 1.55 V.

0x3: 0.0 V (this forward biases a diode at the input).

[9:8]

0x0

R/W

SLOTA_V_CATHODE

If Bit 7 = 1; this setting is applied to the cathode voltage

while the device is in Time Slot A operation. The anode

voltage is always 1.3 V in Time Slot A mode.

0x0: VDD (1.8 V).

0x1: 1.3 V.

0x2: 1.55 V.

0x3: 0.0 V (this forward biases a diode at the input).

0x0

R/W

REG54_VCAT_ENABLE

0: use the cathode voltage settings defined by Register 0x3C,

Bit 9.

1: override Register 0x3C, Bit 9 with cathode settings

defined by Register 0x54, Bits[13:8].

[6:0]

0x20

R/W

Reserved

Write 0x20.

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