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HI-3000H Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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HI-3000H Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
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3 / 12 page  FUNCTIONAL DESCRIPTION OPERATING MODES The HI-3000H provides two modes of operation which are selectable via the STB pin. Table 1 summarizes the modes. due to an unpowered node with high leakage from the bus lines to ground), the split circuit will force the recessive voltage to VDD/2. Short-circuit protection is provided on the CANH, CANL and SPLIT pins. These The short circuit current is limited to less than 200mA typical. A timer circuit prevents the bus lines being driven into a permanent dominant state, which would result in a situation blocking all bus traffic. This could happen in the case of the TXD pin becoming permanently low due to a hardware or application failure. The timer is triggered by a negative edge on the TXD pin (start of dominant state). If the TXD pin is not set high (recessive state) after a typical time of 2ms, the transmitter outputs will be disabled, driving the bus lines into the recessive state. The timer is reset by a positive edge on the TXD pin. Note that the minimum TXD dominant time-out time, tdom = 300μs, defines the minimum possible bit rate of 40kbit/s (the CAN protocol specifies a maximum of 11 successive dominant bits 5 successive dominant bits immediately followed by an error frame). Pin TXD has a pull up in order to force a recessive level if pin TXD is left open. Pins TXD and STB will become floating if power is lost. This will prevent reverse currents via these pins. INTERNAL PROTECTION FEATURES Short-circuit protection TXD permanent dominant time-out Fail-safe features pins are protected from ESD to over 6KV (HBM) and from shorts between -58V and +58V continuous, as specified in ISO 11898-5. − Normal Mode Normal mode is selected by setting the STB pin to a LOW logic level (GND). In this mode, the transceiver transmits and receives data in the usual way from the CANH and CANL bus lines. The differential receiver converts the analog bus data to digital data which is output on the RXD pin (Note: the RXD output on HI-3001H is compatible with 3.3V controllers if the VIO pin is connected to a 3.3V supply). Standby Mode Standby Mode is selected by setting the STB pin to a HIGH logic level. In this mode, the transmitter is switched off and a low power differential receiver monitors the bus lines for activity. A dominant signal of more than 3 s will be reflected on the RXD pin as a logic LOW, where it may be detected by the host as a wake-up request. The device will not leave standby mode until the host forces the STB pin to a logic low. The SPLIT pin provides a stable VDD/2 DC voltage. This pin can be used to stabilize the recessive common mode voltage by connecting the SPLIT pin to the center tap of the split termination (see figure 7). In the case of a recessive bus voltage dropping below the ideal value of VDD/2 (e.g. m SPLIT Circuit MODE STB pin Normal LOW Standby HIGH HOLT INTEGRATED CIRCUITS 3 Table 1 - Operating Modes HI-3000H, HI-3001H |
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