TMD3721 datasheet(69/89 Pages) AMSCO

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[v3-00] 2023-May-26

TMD3721 − Register O ver view

PDATA_L Register (Address 0xF4)

Figure 94:

PDATA_L Register

PDATA_H Register (Address 0xF5)

Figure 95:

PDATA_H Register

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.

Dependent on the configurations, proximity data can be stored

as a 10-bit, 14-bit, or 16-bit value (two bytes). Reading the low

byte first latches the high byte.

When Automatic Pulse Control (APC) is enabled by setting

DISABLE_APC=0 (bit6 of CFG6), proximity detection uses a

10-bit ADC that is extended to a 14-bit or 16-bit dynamic range

for PDATA.

If ENAB_16_BIT_OP =0, PDATA is a 14-bit value,

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

If ENAB_16_BIT_OP =1, PDATA is a 16-bit value,

PDATA = ADCvalue x (64 / actual number of pulses transmitted);

PDATA is therefore proportional to the reflected energy

independent of the number of pulses transmitted.

When Automatic Pulse Control (APC) is disabled by setting

DISABLE_APC=1 (bit6 of CFG6), 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

Addr: 0xF4

PDATA_L

Bit

Bit Name

Default

Access

Bit Description

7:0

PDATA_L

0x00

If APC is enabled, this register contains the

low byte of the 14-bit proximity data.

If APC is disabled, this register contains the

upper 8 most significant bits of the 10-bit

proximity data.

Addr: 0xF5

PDATA_H

Bit

Bit Name

Default

Access

Bit Description

7:0

PDATA_H

0x00

If APC is enabled, this register contains the

high byte of the 14-bit proximity data.

If APC is disabled, bits 1:0 contain the lower 2

bits of the 10-bit proximity value.

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