參數(shù)資料
型號(hào)： AS1523-T
廠商： AUSTRIAMICROSYSTEMS AG
元件分類(lèi)： ADC
英文描述： 10-Bit, 4-Ch, 300ksps, ADC; Package Type: TSSOP-16
封裝： TSSOP-16
文件頁(yè)數(shù)： 15/28頁(yè)
文件大?。?/td> 893K
代理商： AS1523-T
www.austriamicrosystems.com
Revision 1.00
15 - 28
AS1522/AS1523
Data Sheet
- Detailed Description
Control Register
The control register on the AS1522/AS1523 is a 8-bit, write-only register. Data is written to this register using the CSN,
DIN and SCLK pins. The control register format is shown in
Table 7
and the function of the bits are defined in
Table 8
.
The AS1522/AS1523 operating modes are selected by sending an 8-bit data word to the internal shift register via pin
DIN. After pin CSN is pulled low, the first logic 1 on pin DIN is interpreted as a start bit. A start bit is defined as one of
the following:
!
The first logic 1 bit clocked into pin DIN (with CSN low) any time the AS1522/AS1523 is idle, e.g., after V
DD1
and
V
DD2
are applied.
!
The first logic 1 bit clocked into pin DIN after bit 6 of a conversion in progress is clocked out of pin DOUT.
Figure 22 on page 17
shows the serial-interface timing necessary to perform a conversion every 16 SCLK cycles. If
CSN is tied low and SCLK is continuous, guarantee a start bit by first clocking in sixteen 0s. The fastest speed at which
the devices can operate is 16 clocks per conversion (with CSN held low between conversions).
Table 7. Control Byte Format
Bit 7
Bit 6
Bit 5
Bit 4
START (MSB)
SEL2
SEL1
SEL0
Analog Input Configuration
Bit 3
RANGE
Bit 2
MODE
Bit 1
PD1
Bit 0
PD0 (LSB)
Table 8. Bit Descriptions
Bit
7
Name
START
Description
The first logic 1 bit after CSN goes low signifies the start of a control byte.
These three bits select which of the four channels and pin COM are used for
the conversion (see
Table 10
and
Table 11
).
This bit selects the analog input range of the AS1522/AS1523.
0 = The analog input range extends from -V
REF
/2 to +V
REF
/2.
1= The analog input range extends from 0V to V
REF
.
This bit in conjunction with bit RANGE changes the analog input configuration.
0 = The voltage difference between two selectable channels is converted. This
setting selects two's complement coding (see
Table 10 on page 16
and
Table 11 on page 16
).
1 = One of the four input channels is referenced to COM. This setting also
selects binary coding.
Selects the AS1522/AS1523 operating mode:
PD1
PD0
Mode
0
0
Full power-down mode.
0
1
Reduced-power mode.
1
0
Reduced-power mode.
1
1
Normal operation.
6:4
SEL2:SEL0
3
RANGE
2
MODE
1:0
PD1:PD0
Table 9. Analog Input Configuration
Analog Input Configuration
Mode
Range
Coding
Comments
AIN+ from 0 to V
REF
.
COM should be tied to GND.
4-Channel Single-Ended
1
1
Binary
4-Channel Pseudo Differential
referenced to COM
4-Channel Pseudo Differential
referenced to COM
2-Channel Pseudo Differential
2-Channel Pseudo Differential
1
1
Binary
AIN+ from COM to COM + V
REF
1
0
Binary
AIN+ from -V
REF
/2+COM to + V
REF
/2+COM
0
0
1
0
Two's Complement
Two's Complement
AIN+ - AIN- from 0 to V
REF
AIN+ - AIN- from -V
REF
/2 to +V
REF
/2
AIN+ - AIN- from -V
REF
/2 to +V
REF
/2,
fully differential input signal.
2-Channel Fully Differential
0
0
Two's Complement
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