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Pulse-Width Modulators (PWMs)
The WISMO228 contains two Pulse‐Width Modulators (PWMs) that can be used in conjunction with
an external transistor for driving a vibrator, or a backlight LED. Each PWM uses two 7‐bit unsigned
binary numbers: one for the output period and one for the pulse width or the duty cycle.
The relative timing for the PWM output is shown in the figure below.
Electrical Characteristics
The following table describes the electrical characteristics of the PWM interface.
Parameters
VOH
VOL
IPEAK
Frequency
Duty cycle
Pin Description
The following table provides the pin description of the Pulse‐Width Modulators.
Pin #
Signal
35
PWM1
WA_DEV_W228_PTS_002
Figure 29. Relative Timing for the PWM Output
Table 22. Electrical Characteristics of the PWM Interface
Conditions
High impedance load
Load with IoH = 4mA
-
-
-
-
Table 23. PWM Pin Description
I/O
I/O Type
O
2V8
PWM output
Rev 001
Product Technical Specification &
Customer Design Guidelines
Minimum
Typical
2.7
2.85
-
2.4
-
-
-
-
25.6
-
0*
-
Description
Maximum
Unit
-
V
-
V
0.1
V
4
mA
1083.3
kHz
100*
%
Page 66 of 108
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