WA_DEV_W218_PTS_002 Rev 005 Page 78 of 109

Product Technical Specification &

Customer Design Guidelines

Reset

The WISMO218 has an input ~RESET pin. This is a hardware reset and should only be used for

emergency reset.

Feature

The ~RESET signal has a 100K internal pull up resistor to VCC_2V8.

Figure 38. Reset Timing
Table 36. Electrical Characteristics of the Signals
Param eter
Minim um
Typ
Maxim um
Unit
~RESET
Input Impedance ( R )*
-
100K
-
Input Impedance (C)
-
10nF
F
Cancellation time (Ta)
at power up only
-
38
-
ms
VH**
1.57
-
-
V
VIL
-
0
1.2
V
VIH
1.96
2.8
--
V
* Internal pull up resistance
** VH : Hysterisis Voltage

Sequence after an external reset event (~RESET)

To activate the « emergency » reset sequence, the ~RESE T signal has to be set to LOW level manually,

for example, by a push button.

Pin Description

Table 37. Reset Pin Descriptions
Signa l
Pin N umber
I/O
I/O Type
Descr iption
~RESET
12
100K Pull-up
2V8
WISMO218 Reset