User's Manual

URD1 – OTL 5696.1– 022 / 72740 Edition 0.4 HILONC- 3GPS APPLICATION NOTE
: Auxiliary PCM mode timing parameter
3.3. PWM
A single PWM pin is available on the HILONC-3GPS. This is a general purpose PWM which can be used to
drive a vibrating device, keypad backlight or LED. The PWM pin can be controlled by AT commands, allowing
several periods and duty cycles. More details are given in the AT commands specifications document.
PWM output can be set by the user:
Frequency between: 0.125Hz and 8KHz
Duty range from: 0 to 100%
3.3.1. PWM for Buzzer connection
The HILONC-3GPS module can utilize PWM output to drive a buzzer. The buzzer can serve as an abnormal
status alarm.
 Resistors must be added to protect the buzzer. The value of these resistors depends on the buzzer and the
transistor. Normally, they are
set at 1KΩ.
Note d’étude / Technical document :
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