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Rev C, 4/27/2023

Page 24

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FlexSense® I-Series Programmable

Incremental Encoder

FS210/FS310 Datasheet

Finally, the voltage gain of the second-stage buffers in both the A and B paths can be changed under the control of the

TQM2 trim register. The buffer gain can be set to 4 (power-up default), 6, 8, 12, 16, 24, 32, 48 or 64. Changing the TQM2

setting changes the gains of both the A+/A- buffer and the B+/B- buffer together.

Offset Trim Register A (TDCA: [0x0880])

Table 14. TDCA register definition

MSB

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

RSVD

SDCA

MDCA

Table 15. TDCA field description

Bits

Description

MDCA

Magnitude: 4nA/LSB added to A+/A- transimpedance amplifier input selected by SDCA bit

SDCA

Sign bit: Selects whether extra current is to be added to positive- or negative-sense aggregated

photocurrent input to A+/A- transimpedance amplifier

0:

Add current to A- aggregated photocurrent

1:

Add current to A+ aggregated photocurrent

RSVD

Reserved for future use

Offset Trim Register B (TDCB: [0x0881])

Table 16. TDCB register definition

MSB

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

RSVD

SDCB

MDCB

Table 17. TDCB field description

Bits

Description

MDCB

Magnitude: 4nA/LSB added to B+/B- transimpedance amplifier input selected by SDCA bit

SDCB

Sign bit: Selects whether extra current is to be added to positive- or negative-sense aggregated

photocurrent input to B+/B- transimpedance amplifier

0:

Add current to B- aggregated photocurrent

1:

Add current to B+ aggregated photocurrent

RSVD

Reserved for future use