參數(shù)資料
型號: ST72C171
廠商: 意法半導體
英文描述: 8-BIT MCU with 8K FLASH, ADC, WDG, SPI, SCI, TIMERS SPGAs Software Programmable Gain Amplifiers, OP-AMP
中文描述: 8位8K閃存,ADC的,水分散粒劑,SPI和脊髓損傷,定時器SPGAs軟件可編程增益放大器,運算放大器控制器
文件頁數(shù): 43/152頁
文件大?。?/td> 1384K
代理商: ST72C171
ST72C171
43/152
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.
7
0
AZ1
G12
G11
G10
PS11
PS10
NS11
NS10
Gain
inv / Ninv
-1 / 2
-2 / 3
-3 / 4
-4 / 5
-8 / 8
-16 / 16
Comparator
External Loopback
G12
G11
G10
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
1
1
1
OA1 Positive Input
Gain
Adj.
inv
ninv
inv
PS11 PS10
8-step Ref.Voltage 1
OA1PIN
Band Gap Ref. Voltage (1.2V)
0
0
1
0
1
0
OA1 Negative Input
AGND
Floating - Repeater mode
OA1NIN
NS11
0
0
1
NS10
0
1
X
7
0
AZ2
G22
G21
G20
PS21
PS20
NS21
NS20
Gain
inv / Ninv
-1 / 2
-2 / 3
-3 / 4
-4 / 5
-8 / 8
-16 / 16
Comparator
External Loopback
G22
G21
G20
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
1
1
1
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