AS1520/AS1521
Data Sheet - Detailed Description
Starting a Conversion
A conversion is started by clocking a control byte into pin DIN.
With CSN low, each rising edge on SCLK clocks a bit from DIN into the internal shift register, starting with the MSB. A
conversion will only start when a logic 1 is written to the START bit of the 8-bit control register.
Figure 21. Single Conversion Timing Waveforms
CSN
tACQ
SCLK
1
4
8
9
12
16
20
24
DIN
RANGE MODE
Start SEL2 SEL1 SEL0
PD1 PD0
High-Z
High-Z
High-Z
SSTRB
RB1
RB2
RB3
High-Z
DOUT
B9 B8 B7 B6 B5
B4
B3 B2 B1 B0 S1 S0
Idle
Acquire
Single Conversion
Idle
Figure 22. Continuous 16-Clock Conversion Timing Waveforms
CSN
DIN
S Control Byte 0
S Control Byte 1
16 1
S Control Byte 2
161
S
...
1
8
12
8
12
8
12
B9
16
SCLK
High-Z
DOUT
B9
B4
B0
B9
B4
B0
B4
Conversion Result 2
Conversion Result 0
Conversion Result 1
High-Z
SSTRB
www.austriamicrosystems.com
Revision 1.00
17 - 29
AMSCO [ AMS(艾迈斯) ]
