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HI-5113PCIF Datasheet(PDF) 5 Page - Holt Integrated Circuits |
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HI-5113PCIF Datasheet(HTML) 5 Page - Holt Integrated Circuits |
5 / 51 page TRANSCEIVER PROTECTION FEATURES The HI-5110 contains an integrated transceiver operating from 5V and the line driver is capable of maintaining a detectable signal for bus lengths well in excess of recommended CAN 2.0B standards. The digital logic and IO can be powered from 3.3V or 5V. The BUS and SPLIT pins are protected against ESD to over 4KV (HBM) and from shorts between -58V to +58V continuous, as specified in ISO 11898-5. In addition, a Permanent Dominant Timeout protection is implemented by means of an independent counter monitoring the dominant transmission state and automatically shutting off the transmission if it exceeds typically 2ms. a low power receiver monitors the bus for a detectable dominant bit The HI-5110 supports five modes of operation, namely, Initialization Mode, Normal Mode, Loopback Mode, Monitor Mode and Sleep Mode. Initialization mode is used to configure the device before normal operation. Initialization mode is the default mode following RESET and can also be activated by programming the MODE<2:0> bits to <1xx> in the CTRL0 register. Switching to Initialization mode resets the receiver and transmitter. During initialization mode, the error counters are held reset. Normal mode is the standard operating mode of the HI-5110. In this mode, the HI-5110 can transmit, receive and acknowledge messages from the CAN bus, handling all aspects of the CAN protocol. Normal mode is activated by programming the MODE<2:0> bits to <000> in the CTRL0 register. Loopback mode is used for self-test. The transceiver digital input is fed back to the receiver without being transmitted to the bus. Messages are transmitted from the transmit FIFO in the usual way and received by the receive FIFO as if they were received from a remote node on the bus. Acceptance filters can be set up to accept or reject specific messages into the FIFO and all interrupt flags are set as required in the usual way. While in this mode, any bus activity is ignored. Loopback is activated by programming the MODE<2:0> bits to <001> in the CTRL0 register. Monitor mode (also known as listen-only or silent mode) allows the HI-5110 to monitor all bus activity without disturbing the bus. No messages or dominant bits (such as ACK or active error frame bits) are transmitted to the bus while in this mode. Also, the error counters are reset and deactivated. Messages from the bus are received in the same way as Normal Mode and messages that are not acknowledged by another node on the bus are ignored i.e. any frame containing an error will be ignored. Acceptance filters can be set up to reject or accept specific messages into the FIFO and all interrupt flags are set as required in the usual way. Monitor mode is activated by programming the MODE<2:0> bits to <010> in the CTRL0 register. The HI-5110 can be placed in a low power sleep mode if there is no bus activity and the transmit FIFO is empty. In this mode, the internal oscillator and all analog circuitry (transceiver) are off, drawing typically less than 20 A. Note that the SPI bus is active during sleep mode, so it is possible for the host to communicate with the HI-5110 while it is asleep (e.g. load transmit FIFOs). Sleep mode is exited by selecting an alternative mode of operation, or automatic wake up following bus activity can be enabled by setting the WAKEUP bit in the CTRL0 register - in this case . The device will wake up in Monitor Mode. Note that it will take a finite time for the oscillator and analog circuitry to come back on line. Since the internal oscillator takes a finite time to wake up, the message which caused the wake-up may not be stored. Sleep mode is activated by programming the MODE<2:0> bits to <011> in the CTRL0 register. However, the actual mode change will only occur whenever the CAN bus is quiet. If the chip is transmitting, the mode change is delayed until the transmission is complete. If there is bus activity, the mode change is delayed until the receiver protocol control detects an inter-message gap. The HI-5110 supports Standard, Extended and Remote Frames, as defined in the CAN specification IS0 11898- 1:2003(E) (also known as CAN 2.0B). CAN frames are encoded according to the Non-Return-To- Zero (NRZ) method with bit stuffing. NRZ means that the MODES OF OPERATION CAN PROTOCOL OVERVIEW INITIALIZATION MODE NORMAL MODE LOOPBACK MODE MONITOR MODE SLEEP MODE BIT ENCODING Bit timing registers and acceptance filters and masks can only be modified in this mode. m HI-5110 HOLT INTEGRATED CIRCUITS 5 |
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