ZHCSIP5 August 2018 PGA305
PRODUCTION DATA.
The device has the ability to perform temperature compensation through an internal or external temperature sensor. The user can select the source of the temperature measurement with the TEMP_MUX_CTRL bits in TEMP_CTRL register. Note that the device connects to an external temperature sensor through the INT+ and INT– pins.
The T gain block is constructed with a low-flicker-noise, low-offset, chopper-stabilized amplifier. The gain is configurable with two bits in the T_GAIN_SELECT register. Figure 6 shows the T-gain amplifier topology.
The T-gain amplifier can be configured for single-ended or differential operation using the TSEM_N bit in the AMUX_CTRL register. Note that when the T-gain amplifier is set up for single-ended operation, the differential voltage converted by the T ADC is with respect to ground. Table 2 shows the configuration that the user must select for the different temperature sources.
TEMPERATURE SOURCE | T GAIN CONFIGURATION |
---|---|
Internal temperature sensor | Single-ended |
External temperature sensor with one terminal of the sensor connected to ground | Single-ended |
External temperature sensor with neither terminal of the sensor connected to ground | Differential |
The T-gain amplifier must be set up for either the single-ended or differential configuration, depending on the source of signal to the T gain.
NOTE
When T GAIN is configured to measure the internal temperature-sensor output, T GAIN must be configured to operate in single-ended mode and with a gain of 5 V/V.