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ST7261 Scheda tecnica(PDF) 78 Page - STMicroelectronics

Il numero della parte ST7261
Spiegazioni elettronici  LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, ROM MEMORY, LVD, WDG, TIMER
PDF  80 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7261 Scheda tecnica(HTML) 78 Page - STMicroelectronics

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18 SILICON LIMITATIONS
18.1 LVD RESET ON VDD BROWNOUT
If VDD drops into the range 2.4V to 0.5V but
does not go below 0.5V, the LVD reset is not
held low and follows the level of VDD. In this
case, USBVCC may not be correctly acti-
vated.
At power-on, VDD must rise monotonously to
ensure the LVD reset stays low until the VIT+
threshold is crossed (see Figure 58)
To reset the device correctly and recover
normal operation, the VDD must be brought
below 0.5V.
The LVD reset functions correctly if VDD
drops into the range VIT- to 2.4V or if VDD
drops below 0.5V.
Figure 58. LVD Reset on VDD Brownout
VIT-
2.4
0.5
VIT+
RESET
UNCORRECT FUNCTION



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