参数资料
型号: ST7PL35F2UA/XXXE
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
封装: 5 X 6 MM, ROHS COMPLIANT, QFN-20
文件页数: 53/168页
文件大小: 2955K
代理商: ST7PL35F2UA/XXXE
Obsolete
Product(s)
- Obsolete
ST7L34, ST7L35, ST7L38, ST7L39
146/168
CONTROL PIN CHARACTERISTICS (cont’d)
Figure 96. RESET Pin Protection When LVD Is Disabled1)
Notes:
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 in-
ternal 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 13.9.1 on page 145. 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 is less than the absolute maximum value specified for IINJ(RESET) in section
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.
3. In case a capacitive power supply is used, it is recommended to connect a 1M
pull-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).
4. Tips when using the LVD:
- Step 1: Check that all recommendations related to ICCCLK and reset circuit have been applied (see caution in Table 2
on page 8 and notes above)
- Step 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
pull-down on the RESET pin.
- Step 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.
5. Please refer to “Illegal Opcode Reset” on page 124 for more details on illegal opcode reset conditions
0.01F
EXTERNAL
RESET
CIRCUIT
USER
ST7
PULSE
GENERATOR
Filter
RON
VDD
INTERNAL
RESET
WATCHDOG
ILLEGAL OPCODE5)
Required
相关PDF资料
PDF描述
ST7L35F2UA/XXXRE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
ST7L35F2UC/XXXRE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
ST7L39F2MC/XXXE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
ST7L39F2UC/XXXRE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
ST7PL34F2MC/XXXE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
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