参数资料
型号: ST72F324K4B5
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, ROHS COMPLIANT, SHRINK, PLASTIC, DIP-32
文件页数: 43/164页
文件大小: 2897K
代理商: ST72F324K4B5
ST72324Jx ST72324Kx
137/164
CONTROL PIN CHARACTERISTICS (Cont’d)
Figure 77. RESET pin protection when LVD is enabled.1)2)3)4)5)6)7)
Figure 78. RESET pin protection when LVD is disabled.1)2)3)4)
1. The reset network protects the device against parasitic resets.
2. 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).
3. 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 12.10.1. Otherwise the reset will not be taken into account internally.
4. 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 12.2.2 on page 117.
5. 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.
6. In case a capacitive power supply is used, it is recommended to connect a1M
pull-down resistor to the RESET pin
to discharge any residual voltage induced by this capacitive power supply (this will add 5A to the power consumption of
the MCU).
7. Tips when using the LVD:
– 1. Check that all recommendations related to ICCCLK and reset circuit have been applied (see notes above)
– 2. Check that the power supply is properly decoupled (100nF + 10F close to the MCU). Refer to AN1709. If this
cannot be done, it is recommended to put a 100nF + 1M
pull-down on the RESET pin.
– 3. The capacitors connected on the RESET pin and also the power supply are key to avoiding any start-up margin-
ality. 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 5F to 20F capacitor.”
0.01
F
ST72XXX
PULSE
GENERATOR
Filter
RON
VDD
WATCHDOG
LVD RESET
INTERNAL
RESET
EXTERNAL
Recommended
1M
Optional
(note 6)
0.01
F
VDD
0.01
F
EXTERNAL
RESET
CIRCUIT
USER
VDD
4.7k
Required
Recommended
ST72XXX
PULSE
GENERATOR
Filter
RON
VDD
WATCHDOG
INTERNAL
RESET
1
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