ZHCSQ45A january 2023 – july 2023 THVD1454
PRODUCTION DATA
THVD1454 can be used in slow speed or fast speed RS-485 networks by configuring Slew rate control (SLR) pin. Table 8-4 describes slew rate control function.
| Signal state | Driver | Receiver | Comment |
|---|---|---|---|
| SLR = VCC | Maximum speed of operation = 500kbps | Maximum speed of operation = 500kbps | Active high slew rate limiting applied on driver output and glitch filter in receiver path enabled |
| SLR = GND or floating | Maximum speed of operation = 20Mbps | Maximum speed of operation = 20Mbps | Slew rate limiting on driver output disabled and glitch filter in receiver path disabled |
Receiver path in the slow speed mode (500kbps) provides additional noise filtering. To attenuate noise frequency noise pulses from the bus which can be wrongly interpreted as valid data, SLR = VCC enables a low pass filter to filter out pulses with frequency higher than typical 800 kHz.