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ST72C171 Fiches technique(PDF) 43 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) 43 Page - STMicroelectronics

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7.3.9 Register Description
OA1 CONTROL REGISTER (OA1CR)
Read/Write
Reset value: 0000 00000 (00h)
Bit 7 = AZ1
OA1 Autozero Mode.
This bit is set and reset by hardware. It enables
Autozero mode (used to measure the OA1 input
offset).
0: Autozero mode disabled
1: Autozero mode enabled
Bit 6:4 = G1[2:0]
Gain Control.
These bits are set and reset by software and con-
trol the OA1 gain by modifying the resistive loop-
back network. The value of the gain is adjusted to
the desired value (for inverting / non-inverting am-
plification) corresponding to the selected positive
input source - see PS1[1:0] table, Gain Adjust col-
umn.
Bit 3:2 = PS1[1:0]
Positive Input Select / Gain ad-
just
.
These bits are set and reset by software and con-
trol the OA1 positive input selection.
Bit 1:0 = NS1[1:0]
Negative Input Select.
These bits are set and reset by software and con-
trol the OA1 positive input selection.
OA2 CONTROL REGISTER (OA2CR)
Read/Write
Reset value: 0000 0000 (00h)
Bit 7 = AZ2
OA2 Autozero Mode.
This bit is set and reset by hardware. It enables
Autozero mode (used to measure the OA2 input
offset).
0: Autozero mode disabled
1: Autozero mode enabled
Bit 6:4 = G2[2:0]
Gain Control.
These bits are set and reset by software and con-
trol the OA2 gain by modifying the resistive loop-
back network. The value of the gain is adjusted to
the desired value (for inverting/noninverting ampli-
fication) corresponding to the selected positive in-
put source - see PS2[1:0] table, Gain Adjust col-
umn.
70
AZ1
G12
G11
G10
PS11
PS10
NS11
NS10
Gain
inv / Ninv
G12
G11
G10
-1 / 2
0
0
0
-2 / 3
0
0
1
-3 / 4
0
1
0
-4 / 5
0
1
1
-8 / 8
1
0
0
-16 / 16
1
0
1
Comparator
External Loopback
11
1
OA1 Positive Input
Gain
Adj.
PS11 PS10
8-step Ref.Voltage 1
inv
0
0
OA1PIN
ninv
0
1
Band Gap Ref. Voltage (1.2V)
inv
1
0
OA1 Negative Input
NS11
NS10
AGND
0
0
Floating - Repeater mode
0
1
OA1NIN
1
X
70
AZ2
G22
G21
G20
PS21
PS20
NS21
NS20
Gain
inv / Ninv
G22
G21
G20
-1 / 2
0
0
0
-2 / 3
0
0
1
-3 / 4
0
1
0
-4 / 5
0
1
1
-8 / 8
1
0
0
-16 / 16
1
0
1
Comparator
External Loopback
11
1



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