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ST72C171 Fiches technique(PDF) 44 Page - STMicroelectronics

No de pièce ST72C171
Description  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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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72C171 Fiches technique(HTML) 44 Page - STMicroelectronics

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OP-AMP MODULE (Cont’d)
Bit 3:2 = PS2[1:0]
Positive Input Select / Gain ad-
just.
These bits are set and reset by software and con-
trol the OA2 positive input selection.
t
Bit 1:0 = NS2[1:0]
Negative Input Select.
These bits are set and reset by software and con-
trol the OA2 negative input selection.
OA3 CONTROL REGISTER
(OA3CR)
Read/Write
Reset value: 0000 0000 (00h)
Bit 7 = OA3ON
OA3 on/off (low power)
Stand Alone Op-Amp on/off control bit, it is set and
reset by software. It reduces power consumption
when reset.
0: Op-amp 3 off
1: Op-amp 3 on
Note: This bit must be kept cleared in devices
without OA3 (refer to device block diagram and pin
description)
Bit 6:0 = Reserved.
OA2 Positive Input
Gain
Adj.
PS21 PS20
8-step Ref.Voltage 1
inv
0
0
OA2PIN
ninv
0
1
Band Gap Ref. Voltage (1.2V)
inv
1
0
Floating
ninv
1
1
OA2 Negative Input
NS21
NS20
AGND
0
0
Floating -Repeater mode
0
1
OA2NIN
1
X
70
OA3ON
-
-
-
-
---



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