Telit Wireless Solutions BLUEMOD+S42/AI/ADC/LUA, Руководство пользователя

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S42
Hardware User Guide
1VV0301303 Rev. 11
Page 14 of 85 2021-05-06
Not Subject to NDA
3.1.1. Power-up Slew-Rate
Parameter Min Max Unit
VSUP rise time rate (1) 0 60 ms
(1) 0V to 1,7V
Table 2: Power up Rise Time Requirements
3.2. Reset
S42 are equipped with circuitry for generating reset from three sources:
• A reset is held active, when VSUP falls below the threshold of the brownout
detector (VBOR = 1,2V … 1,7V), and is released when VSUP rises above VBOR +
VHYST .
The brownout detector also holds the reset active during power up, until VSUP >
VBOR.
•
A reset is generated, when VSUP is > VBOR and increases 300 mV or more, within
300 ms or less.
• By holding pin B-1 (EXT-RES#) at
≤
VSUP*0,25V for tHOLDRESETNORMAL
≥
0,2µs,
an external reset ( pin reset) is generated. EXT-RES# may be left open if not used.
This pin has:
o
For all the variants except S42/AI/ATEX a fixed internal pull-up
resistor (R
PU
= 11k
Ω
... 16k
Ω
) and a series resistor of 470
Ω
o
For S42/AI/ATEX a fixed internal pull-up resistor (R
PU
= 11k
Ω
...
16k
Ω
). A series resistor less than 560
Ω
should be added externally.
S42
E-6,F-6
VSUP
GND
+3V3
EXT-RES#
B-1
Reset-Switch is optional
Please Note: EXT-RES# of S42 has approx. 13k internal pullup.
Reset signal is optional
Host MCU
GPIO
VDD
Figure 3: S42 Example Reset