ZSSC3123AI2R datasheet(57/67 Pages) RENESAS

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ZSSC3123 Datasheet

August 16, 2018

14.3 Bang-Bang Control System

In this example, the only outputs are the alarm pins. They are programmed to control a high voltage bang-bang humidity control system. External

devices are not needed if not using high voltage.

If the humidity gets too high, the ZSSC3123 activates the dehumidifier using the Alarm_High pin. If the humidity gets too low, it activates the

humidifier with the Alarm_Low pin. The alarm registers must be set to appropriate trip and hysteresis points (see section 3.8). The configuration

settings are shown in Table 36.

The output selection bits should either be set to I2C or SPI since, depending on the PDM configuration, both alarms are not supported.

Additionally, I2C and SPI are lower power than PDM. This application does not use I2C or SPI, so Update Mode must be used because Sleep

Mode commands cannot be sent. The fastest update rate is used for this example. External devices are needed to control the outputs because

a voltage source greater than VDD is used.

The alarm pins control NMOS devices so the alarm pins must be full push-pull and output high when the alarm is on, so the polarity bits are set

to 0 and the open-drain bits are set to 0.

In this example application, a faster response time may be needed, so the AFE configuration settings show 10-bit resolution for both capacitance

and internal temperature. C_Config settings have been selected for a capacitance range of 5.8pF to 7.2pF (see Table 6).

Figure 29. Bang-Bang Control System Example

Dehumidifier

GND

0.1µF

V supply +2.3V to 5.5V

Humidifier

GND

12V

VDD

Vcore

VSS

Alarm_High

Alarm_Low

cLite

ZSSC3123

0.1µF

Table 36. Example 3: Configuration Settings

Configuration Register

ZMDI_Config (Table 29)

0†

Cust_Config (Table 32)

0†

C_Config (Table 30)

0†

T_Config (Table 31)

1†

0†

The factory settings are set for a full span temperature range from -40°C to +125°C. Do not change this setting unless a different temperature

range is needed.

† Reserved setting – do not change factory settings.

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