Datasheet ATA663431, ATA663454 (Microchip) - 6
| Manufacturer | Microchip |
| Description | LIN SBC including LIN Transceiver, Voltage Regulator, Window Watchdog and High-Side Switch |
| Pages / Page | 40 / 6 — ATA663431/54. Table 1-2. TABLE 1-2:. SIGNALING IN FAIL-SAFE MODE. … |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
ATA663431/54. Table 1-2. TABLE 1-2:. SIGNALING IN FAIL-SAFE MODE. Fail-Safe sources. TXD. RXD. 1.3
Model Line for this Datasheet
Text Version of Document
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ATA663431/54
1.2.4 FAIL-SAFE MODE If the device enters Fail-Safe mode coming from The device automatically switches to Fail-Safe mode at Normal mode (EN = 1) due to a VS undervoltage condition (V system power-up. The voltage regulator and the VS < VVS_th_N_F_down), it is possible to switch to Sleep mode or Silent mode through a falling watchdog are switched on. The NRES output remains low for t edge at the EN input. The current consumption can be res = 4 ms and resets the microcontroller. LIN reduced further with this feature. communication is switched off. A wake-up event from either Silent mode or Sleep The IC stays in Fail-Safe mode until EN is switched to mode is indicated to the microcontroller using the two high. The IC then changes to Normal mode. A low at NRES switches the IC directly into Fail-Safe mode. pins RXD and TXD. During Fail-Safe mode the TXD pin is an output and A VS undervoltage condition is also signaled at these together with the RXD output pin signals the fail-safe two pins. The coding is shown in
Table 1-2
. source. A wake-up event switches the IC to Fail-Safe mode.
TABLE 1-2: SIGNALING IN FAIL-SAFE MODE Fail-Safe sources TXD RXD
LIN wake-up (LIN pin) Low Low Local wake-up (WKin pin or CL15 pin) Low High VVS_th_N_F_down (battery) undervoltage detection (VVS < 3.9V) High Low
1.3 Wake-up Scenarios from Silent Mode or Sleep Mode
1.3.1 REMOTE WAKE-UP VIA LIN BUS 1.3.1.1 Remote Wake-up from Silent Mode A remote wake-up from Silent mode is only possible if TXD is high. A voltage less than the LIN pre-wake detection VLINL at the LIN pin activates the internal LIN receiver and starts the wake-up detection timer. A falling edge at the LIN pin followed by a dominant bus level maintained for a given time period (> tbus) and the following rising edge at the LIN pin (see
Figure 1-4
) result in a remote wake-up request. The device switches from Silent mode to Fail-Safe mode, the VCC voltage regulator remains activated and the internal LIN slave termination resistor is switched on. The remote wake-up request is indicated by a low level at the RXD and TXD pins (strong pull-down at TXD). EN high can be used to switch directly to Normal mode. DS50002820B-page 6
2018 Microchip Technology Inc. Document Outline Features General Description Package Types Block Diagram 1.0 Functional Description 1.1 Physical Layer Compatibility 1.2 Operating Modes FIGURE 1-1: Operating Modes TABLE 1-1: Operating Modes (Mode Pin Is Always Low) 1.2.1 Normal Mode 1.2.2 Silent Mode FIGURE 1-2: Switching to Silent mode 1.2.3 Sleep Mode FIGURE 1-3: Switching to Sleep Mode 1.2.4 Fail-Safe mode TABLE 1-2: Signaling in Fail-safe Mode 1.3 Wake-up Scenarios from Silent Mode or Sleep Mode 1.3.1 Remote Wake-up via LIN Bus 1.3.1.1 Remote Wake-up from Silent Mode FIGURE 1-4: LIN Wake-up from Silent Mode 1.3.1.2 Remote Wake-up from Sleep Mode FIGURE 1-5: LIN Wake-up from Sleep Mode 1.3.2 Local Wake-up via WKin Pin FIGURE 1-6: Local Wake-up via WKin pin from Sleep Mode FIGURE 1-7: Local Wake-up via WKin pin from Silent Mode 1.3.3 Local Wake-up via CL15 1.3.4 Wake-up Source Recognition TABLE 1-3: Signaling in Fail-Safe Mode 1.4 Behavior under Low Supply Voltage Conditions FIGURE 1-8: VCC and NRES versus VS (Ramp-up) for ATA663431 FIGURE 1-9: VCC and NRES versus VS (Ramp-down) for ATA663431 FIGURE 1-10: VCC and NRES versus VS (Ramp-up) for ATA663454 FIGURE 1-11: VCC and NRES versus VS (Ramp-Down) for ATA663454 1.5 Voltage Regulator FIGURE 1-12: VCC Voltage Regulator: Supply Voltage Ramp-up and Ramp-down FIGURE 1-13: Power Dissipation: Safe Operating Area: Regulator’s Output Current IVCC versus Supply Voltage VVS at Different Ambient Temperatures (RthvJA = 45 K/W assumed) 1.6 Watchdog FIGURE 1-14: Limp Home (LH) State Diagram 1.6.1 Typical Timing Sequence with RWDOSC = 51 kΩ EQUATION 1-1: FIGURE 1-15: Timing Sequence with RWDOSC = 51 kΩ 1.6.2 Worst-Case Calculation with RWDOSC = 51 kΩ EQUATION 1-2: TABLE 1-4: Typical Watchdog Timings 1.7 Pin Descriptions TABLE 1-5: Pin Description 1.7.1 Bus Data Output Pin (RXD) 1.7.2 Enable Input Pin (EN) 1.7.3 Undervoltage Reset Output Pin (NRES) 1.7.4 Bus Data Input/Output (TXD) 1.7.5 NTRIG Input Pin 1.7.6 Mode Input Pin (MODE) 1.7.7 WDOSC Output Pin 1.7.8 High-side Switch Pins (HSout, HSin) 1.7.9 Limp Home Watchdog Failure Output (LH) 1.7.10 CL15 Pin 1.7.11 Wake Input Pin (WKin) 1.7.12 Ground Pin (GND) 1.7.13 Bus Pin (LIN) 1.7.14 Supply Pin (VS) 1.7.15 Voltage Regulator Output Pin (VCC) Typical Application Circuit 2.0 Electrical Characteristics 2.1 Absolute Maximum Ratings† Electrical Characteristics FIGURE 2-1: Definition of Bus timing Characteristics Temperature Specifications 3.0 Packaging Information 3.1 Package Marking Information LIN SBC including LIN Transceiver, Voltage Regulator, Window Watchdog and High-Side Switch Appendix A: Revision History Revision A (November 2018) Revision B (November 2018) Product Identification System AMERICAS Corporate Office Atlanta Austin, TX Boston Chicago Dallas Detroit Houston, TX Indianapolis Los Angeles Raleigh, NC New York, NY San Jose, CA Canada - Toronto ASIA/PACIFIC Australia - Sydney China - Beijing China - Chengdu China - Chongqing China - Dongguan China - Guangzhou China - Hangzhou China - Hong Kong SAR China - Nanjing China - Qingdao China - Shanghai China - Shenyang China - Shenzhen China - Suzhou China - Wuhan China - Xian China - Xiamen China - Zhuhai ASIA/PACIFIC India - Bangalore India - New Delhi India - Pune Japan - Osaka Japan - Tokyo Korea - Daegu Korea - Seoul Malaysia - Kuala Lumpur Malaysia - Penang Philippines - Manila Singapore Taiwan - Hsin Chu Taiwan - Kaohsiung Taiwan - Taipei Thailand - Bangkok Vietnam - Ho Chi Minh EUROPE Austria - Wels Denmark - Copenhagen Finland - Espoo France - Paris Germany - Garching Germany - Haan Germany - Heilbronn Germany - Karlsruhe Germany - Munich Germany - Rosenheim Israel - Ra’anana Italy - Milan Italy - Padova Netherlands - Drunen Norway - Trondheim Poland - Warsaw Romania - Bucharest Spain - Madrid Sweden - Gothenberg Sweden - Stockholm UK - Wokingham Worldwide Sales and Service
ATA663431/54
1.2.4 FAIL-SAFE MODE If the device enters Fail-Safe mode coming from The device automatically switches to Fail-Safe mode at Normal mode (EN = 1) due to a VS undervoltage condition (V system power-up. The voltage regulator and the VS < VVS_th_N_F_down), it is possible to switch to Sleep mode or Silent mode through a falling watchdog are switched on. The NRES output remains low for t edge at the EN input. The current consumption can be res = 4 ms and resets the microcontroller. LIN reduced further with this feature. communication is switched off. A wake-up event from either Silent mode or Sleep The IC stays in Fail-Safe mode until EN is switched to mode is indicated to the microcontroller using the two high. The IC then changes to Normal mode. A low at NRES switches the IC directly into Fail-Safe mode. pins RXD and TXD. During Fail-Safe mode the TXD pin is an output and A VS undervoltage condition is also signaled at these together with the RXD output pin signals the fail-safe two pins. The coding is shown in
Table 1-2
. source. A wake-up event switches the IC to Fail-Safe mode.
TABLE 1-2: SIGNALING IN FAIL-SAFE MODE Fail-Safe sources TXD RXD
LIN wake-up (LIN pin) Low Low Local wake-up (WKin pin or CL15 pin) Low High VVS_th_N_F_down (battery) undervoltage detection (VVS < 3.9V) High Low
1.3 Wake-up Scenarios from Silent Mode or Sleep Mode
1.3.1 REMOTE WAKE-UP VIA LIN BUS 1.3.1.1 Remote Wake-up from Silent Mode A remote wake-up from Silent mode is only possible if TXD is high. A voltage less than the LIN pre-wake detection VLINL at the LIN pin activates the internal LIN receiver and starts the wake-up detection timer. A falling edge at the LIN pin followed by a dominant bus level maintained for a given time period (> tbus) and the following rising edge at the LIN pin (see
Figure 1-4
) result in a remote wake-up request. The device switches from Silent mode to Fail-Safe mode, the VCC voltage regulator remains activated and the internal LIN slave termination resistor is switched on. The remote wake-up request is indicated by a low level at the RXD and TXD pins (strong pull-down at TXD). EN high can be used to switch directly to Normal mode. DS50002820B-page 6
2018 Microchip Technology Inc. Document Outline Features General Description Package Types Block Diagram 1.0 Functional Description 1.1 Physical Layer Compatibility 1.2 Operating Modes FIGURE 1-1: Operating Modes TABLE 1-1: Operating Modes (Mode Pin Is Always Low) 1.2.1 Normal Mode 1.2.2 Silent Mode FIGURE 1-2: Switching to Silent mode 1.2.3 Sleep Mode FIGURE 1-3: Switching to Sleep Mode 1.2.4 Fail-Safe mode TABLE 1-2: Signaling in Fail-safe Mode 1.3 Wake-up Scenarios from Silent Mode or Sleep Mode 1.3.1 Remote Wake-up via LIN Bus 1.3.1.1 Remote Wake-up from Silent Mode FIGURE 1-4: LIN Wake-up from Silent Mode 1.3.1.2 Remote Wake-up from Sleep Mode FIGURE 1-5: LIN Wake-up from Sleep Mode 1.3.2 Local Wake-up via WKin Pin FIGURE 1-6: Local Wake-up via WKin pin from Sleep Mode FIGURE 1-7: Local Wake-up via WKin pin from Silent Mode 1.3.3 Local Wake-up via CL15 1.3.4 Wake-up Source Recognition TABLE 1-3: Signaling in Fail-Safe Mode 1.4 Behavior under Low Supply Voltage Conditions FIGURE 1-8: VCC and NRES versus VS (Ramp-up) for ATA663431 FIGURE 1-9: VCC and NRES versus VS (Ramp-down) for ATA663431 FIGURE 1-10: VCC and NRES versus VS (Ramp-up) for ATA663454 FIGURE 1-11: VCC and NRES versus VS (Ramp-Down) for ATA663454 1.5 Voltage Regulator FIGURE 1-12: VCC Voltage Regulator: Supply Voltage Ramp-up and Ramp-down FIGURE 1-13: Power Dissipation: Safe Operating Area: Regulator’s Output Current IVCC versus Supply Voltage VVS at Different Ambient Temperatures (RthvJA = 45 K/W assumed) 1.6 Watchdog FIGURE 1-14: Limp Home (LH) State Diagram 1.6.1 Typical Timing Sequence with RWDOSC = 51 kΩ EQUATION 1-1: FIGURE 1-15: Timing Sequence with RWDOSC = 51 kΩ 1.6.2 Worst-Case Calculation with RWDOSC = 51 kΩ EQUATION 1-2: TABLE 1-4: Typical Watchdog Timings 1.7 Pin Descriptions TABLE 1-5: Pin Description 1.7.1 Bus Data Output Pin (RXD) 1.7.2 Enable Input Pin (EN) 1.7.3 Undervoltage Reset Output Pin (NRES) 1.7.4 Bus Data Input/Output (TXD) 1.7.5 NTRIG Input Pin 1.7.6 Mode Input Pin (MODE) 1.7.7 WDOSC Output Pin 1.7.8 High-side Switch Pins (HSout, HSin) 1.7.9 Limp Home Watchdog Failure Output (LH) 1.7.10 CL15 Pin 1.7.11 Wake Input Pin (WKin) 1.7.12 Ground Pin (GND) 1.7.13 Bus Pin (LIN) 1.7.14 Supply Pin (VS) 1.7.15 Voltage Regulator Output Pin (VCC) Typical Application Circuit 2.0 Electrical Characteristics 2.1 Absolute Maximum Ratings† Electrical Characteristics FIGURE 2-1: Definition of Bus timing Characteristics Temperature Specifications 3.0 Packaging Information 3.1 Package Marking Information LIN SBC including LIN Transceiver, Voltage Regulator, Window Watchdog and High-Side Switch Appendix A: Revision History Revision A (November 2018) Revision B (November 2018) Product Identification System AMERICAS Corporate Office Atlanta Austin, TX Boston Chicago Dallas Detroit Houston, TX Indianapolis Los Angeles Raleigh, NC New York, NY San Jose, CA Canada - Toronto ASIA/PACIFIC Australia - Sydney China - Beijing China - Chengdu China - Chongqing China - Dongguan China - Guangzhou China - Hangzhou China - Hong Kong SAR China - Nanjing China - Qingdao China - Shanghai China - Shenyang China - Shenzhen China - Suzhou China - Wuhan China - Xian China - Xiamen China - Zhuhai ASIA/PACIFIC India - Bangalore India - New Delhi India - Pune Japan - Osaka Japan - Tokyo Korea - Daegu Korea - Seoul Malaysia - Kuala Lumpur Malaysia - Penang Philippines - Manila Singapore Taiwan - Hsin Chu Taiwan - Kaohsiung Taiwan - Taipei Thailand - Bangkok Vietnam - Ho Chi Minh EUROPE Austria - Wels Denmark - Copenhagen Finland - Espoo France - Paris Germany - Garching Germany - Haan Germany - Heilbronn Germany - Karlsruhe Germany - Munich Germany - Rosenheim Israel - Ra’anana Italy - Milan Italy - Padova Netherlands - Drunen Norway - Trondheim Poland - Warsaw Romania - Bucharest Spain - Madrid Sweden - Gothenberg Sweden - Stockholm UK - Wokingham Worldwide Sales and Service
