st7pmc2s6 STMicroelectronics, st7pmc2s6 Datasheet - Page 333

• Manufacturer Part Number: st7pmc2s6
• Description: 8-bit Mcu For Automotive With Nested Interrupts, Flash, 10-bit Adc, Brushless Motor Control, 5 Timers, Spi, Linsci?
• Manufacturer: STMicroelectronics

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto
Figure 145. RESET pin protection when LVD is enabled
1. - The reset network protects the device against parasitic resets.
2. When the LVD is enabled, it is recommended not to connect a pull-up resistor or capacitor. A 10nF pull-down capacitor is
3. In case a capacitive power supply is used, it is recommended to connect a 1M pull-down resistor to the RESET pin to
4. Tips when using the LVD:
5. Please refer to
External
- The output of the external reset circuit must have an open-drain output to drive the ST7 reset pad. Otherwise the device
can be damaged when the ST7 generates an internal reset (LVD, illegal opcode or watchdog).
- Whatever the reset source is (internal or external), the user must ensure that the level on the RESET pin can go below the
V
account internally.
- Because the reset circuit is designed to allow the internal RESET to be output in the RESET pin, the user must ensure
that the current sunk on the RESET pin is less than the absolute maximum value specified for I
Current characteristics on page
required to filter noise on the reset line.
discharge any residual voltage induced by the capacitive effect of the power supply (this adds 5µA to the power
consumption of the MCU).
A. Check that all recommendations related to ICCCLK and reset circuit have been applied (see notes above)
B. Check that the power supply is properly decoupled (100nF + 10µF close to the MCU). Refer to AN1709 and AN2017. If
this cannot be done, it is recommended to put a 100nF + 1M pull-down on the RESET pin.
C. The capacitors connected on the RESET pin and also the power supply are key to avoid any start-up marginality. In
most cases, steps 1 and 2 above are sufficient for a robust solution. Otherwise: replace 10nF pull-down on the RESET pin
with a 5µF to 20µF capacitor.”
reset
IL
max. level specified in
Required
Section 11.2.2: Illegal opcode reset
0.01µF
Section 12.9.1: Asynchronous RESET pin on page
1m
Optional
314.
(3)
for more details on illegal opcode reset conditions
V
DD
R
ON
Filter
(1)(2)(4)
generator
Pulse
332. Otherwise the reset is not taken into
Electrical characteristics
INJ(RESET)
Watchdog
Illegal opcode
LVD reset
in
Section 12.2.2:
ST7MC1K2-Auto
ST7MC1K6-Auto
ST7MC2S4-Auto
ST7MC2S6-Auto
(5)
Internal
reset
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