TMD3702VC datasheet(34/57 Pages) OSRAM

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Datasheet, Public

Page 33

[v2-00] 2023-Mar-14

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TMD3702VC − Register Description

PDATAL Register (Address 0x9C)

Figure 49:

PDATAL Register

PDATAH Register (Address 0x9D)

Figure 50:

PDATAH Register

Proximity data is stored as a 14-bit value (two bytes). Reading

the low byte first latches the high byte. Proximity detection uses

an Automatic Pulse Control (APC) mechanism that adjusts the

number of pulses per measurement based on the magnitude of

the reflected IR signal. As the magnitude of the signal increases,

the number of pulses decreases. Proximity detection uses a

10-bit ADC that is extended to a 14-bit dynamic range for PDATA

using the following formula:

PDATA = ADCvalue x (16 / actual number of pulses transmitted)

PDATA is therefore proportional to the reflected energy

independent of the number of pulses transmitted.

If Automatic Pulse Control (APC) is disabled by setting bit 6 in

CFG6 to 1, then the proximity data converts to a 10-bit value.

PDATAL contains the 8 most significant bits of the 10-bit value

and PDATAH bit locations 1:0 contain the lower 2-bits. When

APC is disabled, only the upper 8-bits are compared against the

threshold values contained in PILTL and PIHTL.

Addr: 0x9C

PDATAL

Bit

Bit Name

Default

Access

Bit Description

7:0

PDATAL

0x00

This register contains the low byte of the 14-bit

proximity ADC data when APC is enabled. If APC is

disabled, this register contains the upper 8 most

significant bits of the 10-bit proximity value.

Addr: 0x9D

PDATAH

Bit

Bit Name

Default

Access

Bit Description

7:0

PDATAH

0x00

This register contains the high byte of the 14-bit

proximity ADC data when APC is enabled. If APC is

disabled, bits 1:0 contain the lower 2 bits of the 10-bit

proximity value.

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