ZSSC3230 Datasheet

R36DS0062ED0100 1.4

Jun 10, 2025

Page 13

© 2025 Renesas Electronics

6.2.1 Differential Mode

The most relevant measurement mode is the Differential Measurement Mode, with CMEAS connected between CC and C0

or CC’ and C0 so that both ends of the capacitor are connected to the ZSSC3230. For electrical connections, see Figure 8.

For the ZSSC3230 for the Differential Measurement Mode, the configuration must be done in the EEPROM for parameter

sensecap_type (bit[15] in memory register 12HEX; see Table 16). When the sensecap_type is 0, the differential mode is

selected, which is the default configuration.

C0

CC

CC

ZSSC3230

Vsup

VDD

VSS

SDA

SCL

RESQ

EOC

C0

CC

CC

ZSSC3230

Vsup

VDD

VSS

SDA

SCL

RESQ

EOC

CC Configuration

CC Configuration

Figure 8. Capacitive Input in Differential Mode

6.2.2 Single-Ended Mode

Another measurement mode is the single ended measurement mode, with CMEAS connected between CC and VSS or CC’

and VSS/ground. In this mode C0 is switched to VSS. In this mode only 1 Pin needs to be directly connected to the IC.

Configuring the ZSSC3230 for Single-Ended Input Mode must be done in the EEPROM via the parameter sensecap_type

(bit[15] in memory register 12HEX; see Table 16

). Since the respective bit is defined as “0” in the default configuration for

Differential Mode, the bit must

be programmed to “1.”

6.2.3 Sensor Leakage Compensation

Sensor leakage compensation is an additional option for Single-Ended Mode to enable the

sensor element’s leakage current

compensation. The leakage current is

caused by the sensor element’s parasitic resistance. Enabling this function via the

sensor_leakage bit[14] in memory register 12HEX leads to loss of dynamic range and a decrease in the SNR. With losing 1-

bit effective resolution on leakage compensation, the respective capacitive input range for CSIGNAL will be doubled compared

to the description in section 6.2.