ZSSC3018BA2C datasheet(16/51 Pages) RENESAS

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ZSSC3018 Datasheet

September 8, 2020

Figure 2.3 ADC Gain and Offset Setup

2.3.4 Temperature Measurement

The ZSSC3018 provides an internal temperature sensor measurement to allow compensation for temperature effects. See section 1.3 for the

temperature sensor resolution. The temperature output signal is a differential voltage that is adapted by the amplifier for the ADC input.

For temperature measurements, the respective settings are defined and programmed to the MTP by Renesas.

2.3.5 External Sensor Supply: Bridge Sensors

The ZSSC3018 provides dedicated supply pins VDDB and VSSB for resistive bridge-type sensors (AbsV_enable bit[11]=0 in SM_config

registers 12HEX or 16HEX; see section 3.6.2). The ADC reference voltages for the sensor bridge measurement are derived from these internal

voltages such that bridge supply disturbances are suppressed. The current drive ability of VDDB is limited (see IVDDB in section 1.2).

2.3.6 External Sensor: Absolute Voltage Source Sensors

As an optional alternative to a bridge sensor application, the ZSSC3018 can process signals from an absolute-voltage source sensor; e.g., a

thermopile element. The respective input type can be selected with AbsV_enable bit[11]=1 in SM_config, registers 12HEX or 16HEX. The absolute-

voltage source sensor element must be connected between the INP and INN pins; INN is internally connected to the ZSSC3018’s analog ground

(important: this is not VSSB). Do not connect VDDB and VSSB if an absolute-voltage source sensor is applied. The offset shift should be set to

maximum in this case: Shift_method = 1 and Offset = 111 in SM_config. The required gain can be determined according to the procedure

described in section 2.3.3.

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