6
Beeper Driving Circuit
The illustration for beeper driving circuit is as below. When EM2037 is powered on or decodes a bar code successfully, PWM signal
will be output on PWM_BUZ pin and thus drives the beeper to sound.
Sleep LED Driving Circuit
Illustration for sleep LED driving circuit is as below. When the engine is in sleeping mode, GPIO_PWD pin will output low level and
PWRDWN pin on FPC 12PIN interface will be in high level, indicating EM2037 is in sleeping mode.
