參數(shù)資料
型號: ST7FLIT19B
廠商: 意法半導(dǎo)體
英文描述: 8-Bit MCU With Single Voltage Flash Memory, Data EEPROM, ADC, 5 Timers, SPI(內(nèi)部RC,PLL,ADC,ROP,ICP, IAP,SPI的8位MCU)
中文描述: 8位微控制器單電壓閃存存儲器,數(shù)據(jù)EEPROM,模數(shù)轉(zhuǎn)換器,5計(jì)時(shí)器和SPI(內(nèi)部鋼筋,鎖相環(huán),藝發(fā)局,人事,電感,國際檢察官聯(lián)合會(huì)的SPI的8位微控制器)
文件頁數(shù): 133/155頁
文件大?。?/td> 2968K
代理商: ST7FLIT19B
ST7LITE1xB
133/155
CONTROL PIN CHARACTERISTICS
(Cont’d)
Figure 105. RESET pin
protection when LVD is enabled.
1)2)3)4)
Figure 106. 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 V
IL
max. level specified in
section 13.9.1 on page 132
. 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 I
INJ(RESET)
in
section 13.2.2 on page 109
.
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
pull-down resistor to the RESET
pin to discharge any residual voltage induced by the capacitive effect of the
power supply (this will add 5μA to the power
consumption of the MCU).
Note 4:
Tips when using the LVD:
– 1. Check that all recommendations related to ICCCLK and reset circuit have been applied (see caution in Table 1
on page 7 and notes above)
– 2. 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.
– 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 5μF to 20μF capacitor.”
Note 5:
Please refer to “Illegal Opcode Reset” on page 105 for more details on illegal opcode reset conditions.
0.01
μ
F
ST72XXX
PULSE
GENERATOR
Filter
R
ON
V
DD
INTERNAL
RESET
RESET
EXTERNAL
Required
1M
Optional
(note 3)
WATCHDOG
ILLEGAL OPCODE
5)
LVD RESET
0.01
μ
F
EXTERNAL
RESET
CIRCUIT
USER
Required
ST72XXX
PULSE
GENERATOR
Filter
R
ON
V
DD
INTERNAL
RESET
WATCHDOG
ILLEGAL OPCODE
5)
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