JAJSNN9B May 2023 – November 2023 TMAG5253
PRODUCTION DATA
For remote-sensing applications where the sensor is not physically placed on the same board as the ADC or the microcontroller, it is important to have the ability to drive a capacitive load from the wiring harness. The TMAG5253 enables remote-sensing applications with the ability to support up to 1-nF capacitive load on the OUT pin. With a typical cable capacitance of about 100 pF/m, the TMAG5253 can support up to 10 m in cable length.
Some remote-sensing applications might require a device to detect if interconnect wires open or short. The TMAG5253 can support this feature with the ability to drive up to ±1-mA current load on the output. To design for wire break detection, 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 100 mV of VCC or GND, a fault condition exists. Figure 9-10 shows the circuit, and Table 9-4 describes fault scenarios.
FAULT SCENARIO | VOUT |
---|---|
VCC disconnects | Close to GND |
GND disconnects | Close to VCC |
VCC shorts to OUT | Close to VCC |
GND shorts to OUT | Close to GND |