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LZT 123 1834 67
5.16 Digital to Analogue Converter – DAC
Pin Name Direction Function
20 DAC Output Pulse width modulated signal
The GPIOx has dual functionality. In addition of being a fully programmable GPIO it
also has the capability of becoming a PWM output. This PWM can be used as a DAC
by implementing an RC-filter followed by an optional buffer.
Figure 5.16-1 Typical arrangement for adapting PWM for a DAC function
5.17 Analogue to Digital Converters (ADIN1, ADIN2, ADIN3, ADIN4)
Pin Name Direction Function
26 ADIN1 Input ADC Input 1
27 ADIN2 Input ADC Input 2
28 ADIN3 Input ADC Input 3
13 ADIN4 Input ADC Input 4/GPIO5
ADC pins is converted and stored in a register inside the wireless modem. When the
appropriate AT command is received by the wireless modem, the digital value stored
in the register is read.
The module has a single precision 10-bit ADC, shared by a number of functions
within the module and also through the external interface connections (three
dedicated, one shared). The ADC sharing arrangement is shown below.