ZSSC4151C Datasheet

© 2022 Renesas Electronics Corporation

16

March 25, 2020

7.2 Signal Measurement

7.2.1 Full Bridge Sensor Measurement

The ZSSC4151C measures a differential bridge sensor element signal (BR1P to BR1N). The signal path is ratiometric and fully differential. The

ratiometric reference voltage VREF is equal to (VTOP – VBOT).

7.2.2 Temperature Measurements

The ZSSC4151C supports different methods for acquiring temperature data needed for the conditioning of the sensor signal:



Internal PTAT sensor



External PN-junction temperature sensor connected to the TS1 or TS2 pin and referenced to the sensor top potential (TOP pin)



External resistive half-bridge temperature sensors connected to the TS1 or TS2 pin



Temperature coefficients of the connected resistive sensing element

7.2.3 Measurement Cycle

The measurement cycle is the sequence of measurement tasks processed continuously during the Normal Operation Mode (NOM). It delivers

the raw measurement results from all connected sensor elements and from the supervision functions. The measurements are processed

sequentially, all using the same ADC to convert the analog input voltages to a digital value.

All measurement tasks are executed at least once in the measurement cycle. Measurement tasks that are related to the bridge sensor element

measurements are measured most frequently in the main measurement slots; all other measurements are inserted alternatively as auxiliary

measurements.

The sequence of measurements is retained even if any fault check connected to a measurement is disabled. The sensor signal conditioning is

synchronized to the main measurement tasks to ensure a regular internal output update rate.

The list of available measurements and the complete measurement cycle is described in the ZSSC4151C Functional Description in detail.

Figure 5 shows the principle measurement cycle of the ZSSC4151C using the following abbreviations:

BR = Bridge Measurement

X_AZ = Auto-Zero Measurement

PTAT = Internal Temperature Sensor Measurement

BIST_AFE = Analog Frontend Built-in Self-Test

EXT_T = External Temperature Sensor Measurement

SCC = Sensor Connection Check

SSC = Sensor Short Check

BR_SETTLE = Bridge Settling Task

CMV = Common Mode Voltage Measurement

VDDA = VDDA Measurement

Figure 5. ZSSC4151C Principle Measurement Cycle

VDDA

BR

ROM-based

PTAT_AZ

BR

BR_AZ

PTAT

SCC

SSC

BR

BR

BR

BR

CMV1/2

BR_SETTLE

BR

BIST_AFE

BR

BR

BR

BR

BR

BR_SETTLE

ROM-based

ROM-based

ROM-based

ROM-based

ROM-based

NVM-based

NVM-based

ROM-based

NVM-based

BR

Ext_T

NVM-based