TMD2712 datasheet(31/54 Pages) OSRAM

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TMD2712 − Register Description

PDATAH Register (Address 0x9A)

Figure 43:

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.

REVID2 Register (Address 0xA6)

Figure 44:

REVID2 Register

Addr: 0x9A

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.

Addr: 0xA6

REVID2

Bit

Bit Name

Default

Access

Bit Description

7:4

Reserved

0000

Reserved.

3:0

VER_ID

0000 or 1111

Device version number.

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