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| 型號(hào)： | ST72321BR7T3 |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, QFP64 |
| 封裝： | 14 X 14 MM, ROHS COMPLIANT, LQFP-64 |
| 文件頁(yè)數(shù)： | 67/187頁(yè) |
| 文件大?。?/td> | 3071K |
| 代理商： | ST72321BR7T3 |
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ST72321BRx, ST72321BARx ST72321BJx, ST72321BKx
159/187
CONTROL PIN CHARACTERISTICS (Cont’d)
Figure 86.
RESET pin protection when LVD is enabled.1)2)3)4)
Figure 87. RESET pin
protection when LVD is disabled.1)
Note 1:
– 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 12.9.1 on page 158. 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 en-
sure that the current sunk on the RESET pin is less than the absolute maximum value specified for IINJ(RESET) in
Note 2: When the LVD is enabled, it is recommended not to connect a pull-up resistor or capacitor. A 10nF pull-down
capacitor is required to filter noise on the reset line.
Note 3: In case a capacitive power supply is used, it is recommended to connect a 1M
Ωpull-down resistor to the RESET
pin to discharge any residual voltage induced by the capacitive effect of the power supply (this will add 5A to the power
consumption of the MCU).
Note 4: Tips when using the LVD:
– 1. Check that all recommendations related to 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 and
AN2017. If this cannot be done, it is recommended to put a 100nF + 1M
Ω pull-down on the RESET pin.
– 3. 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 5F to 20F capacitor.
0.01
μF
ST72XXX
PULSE
GENERATOR
Filter
RON
VDD
WATCHDOG
LVD RESET
INTERNAL
RESET
EXTERNAL
Required
1M
Ω
Optional
(note 3)
0.01
μF
EXTERNAL
RESET
CIRCUIT
USER
Required
ST72XXX
PULSE
GENERATOR
Filter
RON
VDD
WATCHDOG
INTERNAL
RESET
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| ST72321BR9-AUTO | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface |
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