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AMIS41682CANM1RG Datasheet(PDF) 7 Page - ON Semiconductor |
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AMIS41682CANM1RG Datasheet(HTML) 7 Page - ON Semiconductor |
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7 / 16 page  AMIS−41682, AMIS−41683 www.onsemi.com 7 • Local Wake−up: Rising or falling edge on input WAKE (levels maintained for a certain period). • Remote Wake−up from CAN Bus: A message with five consecutive dominant bits. On a wake−up request the transceiver will set the output on Pin INH high which can be used to activate the external supply voltage regulator. Note: Pin INH is also set similarly as an after wake up event by VBAT voltage being below the battery power on flag level. (See FLAG_VBAT in Figure 5) If VCC is provided, the wake−up request can be read on the ERR or RXD outputs so the external microcontroller can wake−up the transceiver (switch to normal operating mode) via Pins STB and EN. In the low power modes the failure detection circuit remains partly active to prevent increased power consumption in the event of failures 3, 3a, 4, and 7. The go−to−sleep−mode is only a transition mode. The Pin INH stays active for a limited time. During this time the circuit can still go to another low−power mode. After this time the circuit goes to the sleep−mode. In case of a wake up request (from BUS or WAKE Pin) during this transition time, the wake−up request has higher priority than go−to−sleep and INH will not be deactivated. Behavior in Case of Missing Supplies If VCC is below the threshold level FLAG_VCC, the signals on pins STB and EN will internally be set to low-level to provide fail safe functionality. In this way, a low-power mode will be forced in case of missing/failing VCC supply. Similarly, missing/failing VBAT supply – i.e. VBAT being below FLAG_VBAT level - will lead to a fail-safe behavior of the transceiver by forcing a low-power mode. A forced low-power in case of missing supplies guarantees that the transceiver will in no way disturb the other CAN nodes when the local electronic unit looses ground or battery connection. STB change state Power−On Stand−by High Low Act EN change state STB change state 1) Only when Vcc > POR_Vcc 2) INH active for a time = T_GoToSleep 3) Local Wake−up through pin Wake which change state for a time > T_wake_min Remote Wake−up through pin CANL or CANH when dominant for a time >TCANH_min or TCANL_min 4) Mode Change through pins STB and EN is only possible if Vcc > POR_Vcc STB ERR RxD INH EN RTL POR− flag WU− int Vbat Normal Mode High High Act STB ERR RxD INH EN RTL Err− flag Rec. out Vcc Standby Mode Low Low Act STB ERR RxD INH EN RTL Vbat GoTo Sleep Mode Low High Act 2) STB ERR RxD INH EN RTL Vbat Sleep Mode Low Low Hz STB ERR RxD INH EN RTL Vbat WU− int WU− int WU− int WU− int WU− int 1) WU− int 1) EN change state EN, STB change state EN, STB change state Time−out GoToSleep mode Local or Remote Wake−up 3) Power−On Mode Change 4) Figure 5. Low Power Modes Power−On After power−on (VBAT switched on) the signal on Pin INH will become high and an internal power−on flag will be set. This flag can be read in the power−on standby mode via pin ERR (STB = 1; EN = 0) and will be reset by entering the normal operating mode. Protections A current limiting circuit protects the transmitter output stages against short circuit to positive and negative battery voltage. If the junction temperature exceeds a maximum value, the transmitter output stages are disabled and flagged on the ERR pin. Because the transmitter is responsible for the major part of the power dissipation, this will result in reduced power dissipation and hence a lower chip temperature. All other parts of the IC will remain operating. The Pins CANH and CANL are protected against electrical transients that may occur in an automotive environment. |
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Similar Description - AMIS41682CANM1RG |
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