AFE4403 datasheet(32/97 Pages) TI

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Timer Compare

16-Bit Register 11

16-Bit Counter

Timer Compare

16-Bit Register 1

Start

Stop

Timer Compare

16-Bit Register 2

Start

Stop

Timer Compare

16-Bit Register 3

Start

Stop

Timer Compare

16-Bit Register 4

Start

Stop

Timer Compare

16-Bit Register 5

Start

Stop

Timer Compare

16-Bit Register 6

Start

Stop

Timer Compare

16-Bit PRF Register

PRF

Pulse

Timer Compare

16-Bit Register 7

Start

Stop

Timer Compare

16-Bit Register 8

Start

Stop

Timer Compare

16-Bit Register 9

Start

Stop

Timer Compare

16-Bit Register 10

Start

Stop

START-A

STOP-A

START-B

STOP-B

START-C

STOP-D

START-D

STOP-D

RED LED

IR LED

Sample RED

Reset

Counter

Reset

SIR

Sample IR

SR_amb,

Sample Ambient

(red phase)

SIR_amb,

Sample Ambient

(IR phase)

CONVR,

Convert RED Sample

CONVIR,

Convert IR Sample

CONVIR_amb,

Convert Ambient Sample

(IR Phase)

CONVR_amb,

Convert Ambient Sample

(RED Phase)

ADC

Conversion

Timer Module

Enable

CLKIN

START

STOP

Set

Reset

Enable

Timer Compare Register

Start Reference Register

Stop Reference Register

Counter

Input

Output

Signal

AFE4403

SBAS650B – MAY 2014 – REVISED JULY 2014

www.ti.com

For the timing signals in Figure 41, the start and stop edge positions are programmable with respect to the PRF

period. Each signal uses a separate timer compare module that compares the counter value with

preprogrammed reference values for the start and stop edges. All reference values can be set using the SPI

interface.

After the counter value has exceeded the stop reference value, the output signal is set. When the counter value

equals the stop reference value, the output signal is reset. Figure 46 shows a diagram of the timer compare

Figure 46. Compare Register

The ADC conversion signal requires four pulses in each PRF clock period. Timer compare register 11 uses four

sets of start and stop registers to control the ADC conversion signal, as shown in Figure 47.

Figure 47. Timer Module

8.3.3.1 Using the Timer Module

The timer module registers can be used to program the start and end instants in units of 4-MHz clock cycles.

These timing instants and the corresponding registers are listed in Table 2.

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