Domestic SIT1042 is perfectly compatible with TJA1042 (NXP brand)

The SIT1042Q represented by Hangzhou Dongwo Electronics is an interface chip used between the CAN protocol controller and the physical bus. It can be used in trucks, buses, cars, industrial control and other fields. It supports 5Mbps CAN FD flexible data rate and has the ability to transmit differential signals between the bus and the CAN protocol controller. The domestic CAN FD bus interface chip SIT1042Q, 5V power supply, I/O port compatible with 3.3V, ±58V bus withstand voltage, standby mode CAN FD bus transceiver. Check the "SIT1042Q Datasheet" product manual to know:

Features of CAN FD bus interface chip SIT1042Q

√ Fully compatible with the "ISO 11898" standard;

√ Built-in over-temperature protection function;

√ Bus port ±58V withstand voltage;

√ Driver (TXD) dominant timeout function;

√ Standby bus (BUS) explicit timeout function;

√ Low power standby mode with wake-up function;

√ SIT1042QT/3 I/O voltage range supports 3.3V and 5V MCUs;

√ Undervoltage protection on VCC and VIO power pins;

√ High-speed CAN, supporting 5Mbps CAN FD (Flexible Data Rate);

√ High anti-electromagnetic interference capability;

√ Unpowered nodes do not interfere with the bus;

√ SIT1042QT, SIT1042QT/3 package SOP-8

√ SIT1042QTK/3 supports HVSON-8 / DFN3*3-8, small form factor, leadless package;

√ Meet AEC-Q100 certification standards;

Detailed explanation of the functions of the CAN FD bus interface chip SIT1042Q

1) Short-circuit protection: SIT1042Q has a current limiting protection function to prevent the drive circuit from short-circuiting to the positive and negative power supply voltages. When a short circuit occurs, the power consumption will increase. The short-circuit protection function can protect the drive stage from being damaged.

2) Over-temperature protection: After the SIT1042Q over-temperature protection is triggered, the current of the driver stage will decrease. Because the driver tube is the main energy-consuming component, the reduction in current can reduce power consumption and thus reduce the chip temperature. At the same time, other parts of the chip remain normal.

3) Undervoltage protection: SIT1042Q has an undervoltage detection function that puts the device into protected mode. This protects the bus (bus output high impedance state) when VCC is lower than Vuvd_VCC or VIO is lower than Vuvd_VIO (if applicable).

4) Control mode: The SIT1042Q control pin STB allows selection of high-speed mode and standby mode.

5) Dominant timeout function: In high-speed mode, if the low level on pin TXD lasts longer than the internal timer value (tdom_BUS), the transmitter will be disabled and the bus will be driven into a recessive state. This prevents pin TXD from being forced to a permanent low level due to hardware or software application failure, causing the bus line to be driven into a permanent dominant state (blocking all network communications). A rising edge signal on pin TXD can reset it.

In standby mode, if the bus is dominant for more than (tdom_BUS), the RXD pin will be forced high. This prevents permanent wake-up due to a bus short circuit or a fault in one of the other nodes on the network. A reset occurs when the bus changes from dominant to recessive.

CAN FD bus interface chip SIT1042Q model and pin distribution diagram

According to the SIT1042Q and TJA1042 product manuals, the SIT1042Q represented by Dongwo Electronics can perfectly replace the international brand NXP TJA1042 chip. The specific replacement model details are as follows:

1) SIT1042QT: SOP-8 package, can replace TJA1042T pin to pin;

2) SIT1042QT/3: SOP-8 package, can be pin to pin to replace TJA1042T/3;

3) SIT1042QTK/3: HVSON-8 (DFN3*3-8) package, can be pin-to-pin replacement for TJA1042TK/3.