SBAS639C October 2017 – July 2018 DRV5055-Q1
Some systems must detect if interconnect wires become open or shorted. The DRV5055-Q1 can support this function.
First, select a sensitivity option that causes the output voltage to stay within the VL range during normal operation. Second, add a pullup resistor between OUT and VCC. TI recommends a value between 20 kΩ to 100 kΩ, and the current through OUT must not exceed the IO specification, including current going into an external ADC. Then, if the output voltage is ever measured to be within 150 mV of VCC or GND, a fault condition exists. Figure 20 shows the circuit, and Table 1 describes fault scenarios.
|VCC disconnects||Close to GND|
|GND disconnects||Close to VCC|
|VCC shorts to OUT||Close to VCC|
|GND shorts to OUT||Close to GND|