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AFE031

SBOS531D – AUGUST 2010 – REVISED MAY 2012

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PIN DESCRIPTIONS

DAC (Pin 7)

The DAC pin is used to configure the SPI to either read or write data to the Command and Data Registers, or to

write data to the DAC register. Setting the DAC pin high allows access to the DAC register. Setting the DAC pin

low allows access to the Command and Data Registers.

SD (Pin 8)

The Shutdown pin (SD) can be used to shut down the entire AFE031 for maximum power savings. When the SD

pin is low, normal operation of the AFE031 occurs. When the SD pin is high, all circuit blocks within the AFE031,

including the serial interface, are placed into the lowest-power operating modes. In this condition, the entire

AFE031 draws only 95

μA of current. All register contents at the time the AFE031 is placed into shutdown mode

are saved; upon re-enabling the AFE031, the register contents retain the respective saved values.

INT Pin (9)

The Interrupt pin (INT) can be used to signal the microprocessor of an unusual operating condition that results

from an anomaly on the ac mains. The INTpin can be triggered by two external circuit conditions, depending

upon the Enable Register settings. The AFE031 can be programmed to issue an interrupt on these conditions:

•

Current Overload

•

Thermal Overload

Current Overload

The maximum output current allowed from the Power Amplifier can be programmed with the external RSET

resistor connected between PA_ISET (pin 46) and ground. If a fault condition should occur and cause an

overcurrent event for the PA, the PA goes into current limit and the I_FLAG bit (location 6 in the RESET

results in an interrupt signal at the INT pin. The I_FLAG bit remains set to '1' even after the device returns to

normal operation. The I_FLAG bit remains at '1' until it is reset by the microprocessor.

If the I_FLAG_EN bit (location 6 in the Control2 Register) is disabled and a current overload condition occurs, the

PA goes into current-limit mode to protect the AFE031; however, the contents of the I_FLAG bit (location 6 in the

RESET Register) remain at the respective previous values (presumably '0' for normal operation), and the

AFE031 does not issue an interrupt at the INT pin.

Thermal Overload

The AFE031 contains internal protection circuitry that automatically disables the PA output stage if the junction

temperature exceeds +150°C. If a fault condition occurs that causes a thermal overload, and if the T_FLAG_EN

bit (location 5 in the Control2 Register) is enabled, the T_FLAG bit (location 5 in the RESET Register) is set to a

'1'. This configuration results in an interrupt signal at the INT pin. The AFE031 includes a thermal hysteresis and

allows the PA to resume normal operation when the junction temperature reduces to +135°C. The T_FLAG bit

remains set to a '1' even after the device returns to normal operation. The T_FLAG bit remains '1' until it is reset

by the microprocessor.

If the T_FLAG_EN bit (location 5 in the Control2 Register) is disabled and a thermal overload condition occurs,

the PA continues to go into thermal limit and protect the AFE031, but the contents of the T_FLAG bit (location 5

in the RESET Register) remain at the previous value (presumably '0' for normal operation), and the AFE031 does

not issue an interrupt at the INT pin.

Once an interrupt is signaled (that is, INT goes low), the contents of the I_FLAG and T_FLAG bits can be read

by the microprocessor to determine the type of interrupt that occurred. Using the Control2 Register, each

interrupt type (current or thermal) can be individually enabled or disabled, allowing full user customization of the

INT function. For proper operation of the interrupt pin it is recommended to configure the interrupt enable

registers in the Control2 Register by writing to bit locations 5, 6, and 7 following the information in Table 18 after

each time the AFE031 is powered on. Failure to properly configure bit locations 5, 6, and 7 after power on may

result in unexpected interrupt signals.

Product Folder Link(s): AFE031

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