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ST72361AR4-Auto Datasheet(PDF) 246 Page - STMicroelectronics

Part # ST72361AR4-Auto
Description  Clock, reset and supply management
PDF  279 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72361AR4-Auto Datasheet(HTML) 246 Page - STMicroelectronics

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Electrical characteristics
ST72361xx-Auto
246/279
Doc ID 12468 Rev 3
RESET circuit design recommendations
The reset network protects the device against parasitic resets. 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 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 VIL max. level specified in Section 20.10.1: Asynchronous
RESET pin. Otherwise the reset will not be taken into 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 (by an external pull-up for
example) is less than the absolute maximum value specified for IINJ(RESET) in
Section 20.2.2: Current characteristics.
RESET pin protection when LVD is disabled
Figure 112. RESET pin
protection when LVD is disabled
RESET pin protection when LVD is enabled
Figure 113. RESET pin protection when LVD is enabled
Note:
When the LVD is enabled, it is mandatory not to connect a pull-up resistor. A 10nF pull-down
capacitor is recommended to filter noise on the reset line.
In case a capacitive power supply is used, it is recommended to connect a 1 M
pull-down
resistor to the RESET pin to discharge any residual voltage induced by this capacitive power
supply (this will add 5 µA to the power consumption of the MCU).
0.01µF
EXTERNAL
RESET
CIRCUIT
USER
VDD
4.7k
Required
ST72XXX
PULSE
GENERATOR
Filter
RON
VDD
WATCHDOG
INTERNAL
RESET
0.01µF
ST72XXX
PULSE
GENERATOR
Filter
RON
VDD
WATCHDOG
LVD RESET
INTERNAL
RESET
RESET
EXTERNAL
Recommended
1M
Optional
(see note )



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