TH8056_12 Datasheet, PDF (14/34 Pages) Melexis Microelectronic Systems – Enhanced Single Wire CAN Transceiver

TH8056
Enhanced Single Wire CAN Transceiver
V_TxD
50%
t
V_CANH
Vih
t
VRxD
50%
t
t_rb
Figure 4 – Receive Blanking Time
3. Functional Description
3.1 TxD Input pin
Logic command to transmit on the single wire CAN bus
TxD Polarity
TxD = logic 1 (or floating) on this pin produces an undriven or recessive bus state (low bus voltage)
TxD = logic 0 on this pin produces either a bus normal or a bus high-voltage dominant state
depending on the transceiver mode state (high bus voltage)
If the TxD pin is driven to a logic low state while Mode 0,1 pins are in the 0,0 or sleep state, the transceiver
cannot drive the CAN Bus pin to the dominant state.
The transceiver provides an internal pull up on the TxD pin, which will cause the transmitter to default to the
bus recessive state, when TxD is not driven.
TxD input signals are standard CMOS logic levels for 3.3V and 5V supply voltages.
TH8056 – Datasheet
3901008056
Page 14 of 34
June 2012
Rev 014