ZSC31050 Datasheet

© 2022 Renesas Electronics Corporation

13

January 14, 2022

The digital signal correction takes place in the calibration microcontroller (CMC). It is based on a special correction formula located in the ROM

and sensor-specific coefficients (stored in the EEPROM during calibration). Depending on the programmed output configuration, the corrected

at two flexible I/O modules (FIO) and at the serial interface (SIF). The configuration data and the correction parameters can be programmed

into the EEPROM via the digital interfaces.

The modular circuit concept used in the design of the ZSC31050 allows fast customization of the IC for high-volume applications if needed.

Circuit blocks and functions can be added or removed, which can reduce the die size (see section 7 for more details).

2.2 Application Modes

For each application, a configuration set must be established (generally prior to calibration) by programming the on-chip EEPROM regarding to

the following modes:



Sensor channel

— Sensor mode: ratiometric voltage or current supply mode.

— Input range: the gain of the analog front end must be chosen with respect to the maximum sensor signal span, which also requires

adjusting the zero point of the ADC.

— Additional offset compensation, the Extended Zero-Point Compensation (XZC), must be enabled if required; e.g., if the sensor offset

voltage is close to or larger than the sensor span.

— Resolution/response time: The ADC must be configured for resolution and conversion settings (1st or 2nd order). These settings

influence the sampling rate, signal integration time, and, as a result, the noise immunity.

— Polarity of the sensor bridge inputs: this allows inverting the sensor bridge inputs



Analog output

— Choice of output type (voltage value, current loop, or PWM) for output register 1.

— Optional additional output register 2: PWM via IO1 pin or alarm out module via IO1 or IO2 pin.



Digital communication: The protocol and its parameters must be selected.



Temperature

— The temperature sensor type for the temperature correction must be chosen (only main channel (T1) is usable for correction).

— Optional: a secondary temperature sensor (T2) can be chosen as a second sensor output.



Supply voltage: For non-ratiometric output, the voltage regulation must be configured.

Note:

Not all possible combinations of settings are allowed (see section 2.5).

The calibration procedure must include establishing the coefficients for calibration calculation and the following steps depending on

configuration:



Adjustment of the extended offset compensation



Zero compensation of temperature measurement



Adjustment of the bridge current



Settings for the reference voltage if using the reference voltage



Settings for the thresholds and delays for the alarms if using the alarms