ZSSC3154 Datasheet

R36DS0046ED0160 Rev.1.50

Apr 19, 2024

Page 13

PGA Gain

aIN

Maximum Input Span

VIN_SPAN [mV/V] 1

Input Common Mode Range

VIN_CM [% VDDA] 2

XZC = Off

XZC = On

210

3.6

29 to 65

45 to 55

140

5.4

29 to 65

45 to 55

105

7.1

29 to 65

45 to 55

70

10.7

29 to 65

45 to 55

52.5

14.3

29 to 65

45 to 55

35

21.4

29 to 65

45 to 55

26.3

28.5

29 to 65

45 to 55

14

53.75

29 to 65

45 to 55

9.3

80

29 to 65

45 to 55

7

107

29 to 65

45 to 55

2.8

267

32 to 57

Not applicable

1.

Recommended maximum internal signal range is 80% of supply voltage.

Span is calculated by the following formula: VIN_SPAN = 0.8 (VVBR_T – VVBR_B) / aIN.

2.

Refer to section 3.8.2 for an explanation of the analog offset compensation.

Recommendation: To achieve the best stability and linearity performance of the AFE, operate the PGA in a

voltage range within 10% to 90% of the ratiometric reference voltage VREF = (VVBR_T

– VVBR_B). The gain must be

selected to guarantee this constraint for the entire operating temperature range of the application and for the

specified sensor bridge tolerances.

3.8.2

Offset Compensation

The ZSSC3154 supports two methods for sensor offset compensation:

■

Digital offset correction is processed during the signal conditioning calculation by the calibration micro-

controller (CMC).

■

Extended analog offset compensation (XZC) is achieved by adding a compensation voltage into the analog

signal path. This removes large offsets up to 300% of signal span and prevents overdriving the analog signal

path.

Table 6. Extended Analog Offset Compensation Ranges (XZC)

PGA Gain

aIN

Maximum

Input Span

VIN_SPAN [mV/V]

Offset Shift / XZC Step

[% VIN_SPAN]

Maximum Offset Shift

[mV/V]

Maximum Offset Shift

(XZC = ±31)

[% VIN_SP]

420

1.8

12.5

7.8

388

280

2.7

7.6

7.1

237

210

3.6

12.5

15.5

388

140

5.4

7.6

14.2

237

105

7.1

12.5

31

388

70

10.7

7.6

28

237

52.5

14.3

12.5

62

388

35

21.4

7.6

57

237

26.3

28.5

5.2

52

161

14

53.6

12.5

233

388

10

80

7.6

207

237

7

107

5.2

194

161

2.8

267

0.83

78

26