ZSSC3018BA2C datasheet(18/51 Pages) RENESAS

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ZSSC3018 Datasheet

September 8, 2020

3. Functional Description

3.1 Power-Up

Specifications related to power-up are given in sections 1.2 and 1.3. On power-up, the ZSSC3018 communication interface is able to receive

the first command after the time tSTA1 from when the VDD supply is within operating specifications. The ZSSC3018 can begin the first

measurement after the time tSTA2 from when the VDD supply is operational. As an alternative to a power-on-reset, a reset and new power-up-

sequence can be triggered by an IC-reset signal (high low) at the RES pin.

The wake-up time from Sleep Mode to Active State (see section 3.3) after receiving the activating command is defined as tWUP1 and tWUP2. In

Command Mode, subsequent commands can be sent after tWUP1. The first measurement starts after tWUP2 if a measurement request has been

sent.

3.2 Measurements

Available measurement procedures are



AZSM: auto-zero (external) sensor measurement



SM: (external) sensor measurement



AZTM: auto-zero temperature measurement



TM: temperature measurement

AZSM: The configuration for the external sensor measurement, i.e. a resistive bridge or an absolute-voltage source, is loaded. The multiplexer

block connects the amplifier input to the AGND analog ground reference. An analog-to-digital conversion is performed so that the inherent

system offset for the respective configuration is converted by the ADC to a digital value, quantized according to the respective MTP

configuration.

SM: The configuration for the external sensor measurement, i.e. a resistive bridge or an absolute-voltage source, is loaded. The multiplexer

connects the amplifier input to the INP and INN pins accordingly. An analog-to-digital conversion is performed. The result is a digital value with

a resolution according to the MTP configuration.

AZTM: The configuration for temperature measurements is loaded. The multiplexer connects the amplifier input to AGND. An analog-to-digital

conversion is performed so that the inherent system offset for the temperature configuration is converted by the ADC to a digital value, quantized

according to the respective MTP configuration.

TM: The configuration for temperature measurements is loaded. The multiplexer connects the amplifier input to the internal temperature sensor.

An analog-to-digital conversion is performed. The result is a digital value with a resolution according to the MTP configuration.

The typical application’s measurement cycle is a complete SSC measurement (using one of the commands AAHEX to AFHEX) with AZSM, SM,

AZTM, and TM followed by a signal correction calculation.

3.3 Interrupt (EOC Pin)

The EOC pin can be programmed to operate either as a pure “measurement busy” and end-of-conversion (EOC) transducer, or as a configurable

interrupt transducer. The respective basic operation must be programmed to the INT_setup bits [1:0] in register 02HEX[8:7] (see section 3.6.2).

One or two 24-bit-quantized thresholds can be programmed (TRSH1, TRSH2 in memory registers13HEX, 14HEX and 15HEX).

Dependent on the INT_setup selection, the EOC pin provides a logic 1 or logic 0 (also dependent on the respective interface setup; e.g., SPI

with logic 0  VDD or logic 0  VSS, etc.) according to the SSC-corrected result. The respective thresholds are programmed left-aligned in

the memory, such that they must be programmed with the threshold’s MSB in the memory register’s MSB, etc. The LSBs of the 24-bit threshold

in the memory must be truncated to the number of bits of the selected ADC resolution (according to Adc_bits).

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