Detection Of The Internal State - Renesas RAA3064002GFP User Manual

RAA3064002GFP/RAA3064003GFP 2. Circuit Configuration
2.3.5

Detection of the Internal State

This IC can detect the levels of the signals being input to the differential amplifiers and excessive temperatures within the
chip. A signal from among these can be selected for output, allowing the external monitoring of the IC's internal state.
The signal from monitoring can be handled in two ways: as an AC signal or as a DC signal following half-wave
rectification and filtering by an external low-pass filter. The signal to be monitored is output from the MNTOUT pin.
The internal signal to be output is specified by using the monitor output selection register (MNTSL). The output mode is
specified by using the monitor output mode selection register (MDCACSEL). Figure 2.7 shows an example of the
monitoring circuit and external connections.
This IC
Monitoring circuit
SW1
MNTOUT
Internal signals
Monitoring as a DC signal
Reference
voltage
Monitoring as an AC signal
SW2
Figure 2.7 Example of the Monitoring Circuit and External Connections
Detecting whether inputs to the XAP and XAN pins and XBP and XBN pins are within the allowable voltage range is
possible by reading the output from the ALARM# pin. The ALARM# pin outputs the low level when a differential signal is
out of the allowable range. This function is not applicable to the inputs to the I1INN and I1INP pins and I2INN and I2INP
pins.
Detection of an excessive temperature within the chip is also possible by reading the output from the ALARM# pin.
The ALARM# pin outputs the low level when the temperature exceeds the specified upper limit.
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Apr 05, 2021