ZSSC3240CC1B datasheet(14/64 Pages) RENESAS

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ZSSC3240

Datasheet

Nov.27.20

Page 14

Table 6.

PGA Gain: Stage 2

Gain_stage2[2:0]

Gain2 [V/V]

bit[2]

bit[1]

bit[0]

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

In addition to the amplification of the sensor input signals, the PGA’s first stage can perform an absolute offset

shifting of the differential sensor signal. This shift operation can be programmed in 1mV steps with the

configuration setup ioffsc bit field in the SM_config2 and extTemp_config2 registers. The effective voltage-shift

depends on the selected Gain1, Gain_stage1. The VIOFFSC values (in Table 8) correspond to the higher Gain1

values, i.e. Gain1 > 100. The PGA-operation including shift effect for a differential input signal, VDIFFin can be

described as:

VADC,IN = Gain2

∙ Gain

∙ (V

DIFFin + VIOFFSC) − Gain2

∙ V

IOFFSC

Equation 1

Table 7.

Absolute Offset Shift

– Properties

Symbol

Parameter

Minimum

Typical

Maximum

Units



IOFFSC

Relative accuracy of the effectively applied Offset Shift

referenced to the selected setup per ioffsc[4:0], IC-to-IC variation

0.89

0.98

1.07

TCneg,IOFFSC

1st order temperature coefficient for the change of the effective

Offset Shift voltage for negative-voltage shift effects, i.e.

ioffsc[4]=0

-0.25

-0.21

PPT/K

TCpos,IOFFSC

1st order temperature coefficient for the change of the effective

Offset Shift voltage for positive-voltage shift effects, i.e.

ioffsc[4]=1

0.21

0.25

PPT/K

SNRIOFFSC

Fluctuation of output offset signal (VIOFFSC) versus nominal value

at 25°C; 20·log10(VIOFFSC/VIOFFSC)

–

The shifting can be configured independently for the main sensor and the optional, external temperature sensor.

If the absolute offset shifting is enabled, then the ZSSC3240 current consumption increases by 100µA. The

advantage of absolute offset shifting is an increase of analog dynamic range in the ZSSC3240’s sensor front-

end, which results in higher measurement result quality (less noise/fluctuations).

Table 8.

Absolute Offset Shift

– Differential Sensor Signal’s Offset Compensation

ioffsc[4:0]

Shift Effect, VIOFFSC

bit[4]

bit[3]

bit[2]

bit[1]

bit[0]

0mV, no shift

-1mV

-2mV

-3mV

-4mV

-5mV

-6mV

-7mV

-8mV

-9mV

-10mV

-11mV

-12mV

-13mV

-14mV

-15mV

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