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ST72C171 Datasheet(PDF) 41 Page - STMicroelectronics

No. de pieza ST72C171
Descripción Electrónicos  8-BIT MCU with 8K FLASH, ADC, WDG, SPI, SCI, TIMERS SPGAs Software Programmable Gain Amplifiers, OP-AMP
PDF  152 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72C171 Datasheet(HTML) 41 Page - STMicroelectronics

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OP-AMP MODULE (Cont’d)
7.3.6 DAC Function using ART Timer PWMR
Outputs
The PWMR outputs are connected to a serial re-
sistor and internally connected to the OA1PIN/
OA2PIN inputs. An external capacitor must be
connected
to
the
PWM0R/OA1PIN
and/or
PWM1R/OA2PIN pins (see Figure 28) if the
PWMR outputs are used.
This feature allows the microcontroller to be used
as a Digital to Analog converter and generating a
DC voltage on the positive input pin, so the SPGAs
may be used for the following functions:
– A comparator
– An amplifier of an external voltage connected to
the negative input pin (OA1NIN or OA2NIN).
– A repeater, to obtain the same voltage on the OA
output pin as on the input pin, with increased cur-
rent capability.
Figure 28. Connection of PWMR outputs to OA1 or OA2 for DAC Function
0.7K (typ)
Cext
Rint
PWM/ART TIMER
OA2
OPAMP MODULE
OA1
0.7K (max)
Cext
Rint
PWM1
PWM0R/OA1PIN
PWM1R/OA2PIN
MISC2 REGISTER
P1OSP0OS
OE1 OE0
PWMCR REGISTER
PWM0
P1OS
OE1



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