AS1520/AS1521
Data Sheet - Application Information
Figure 33. Operational Diagram
+3 to +5V
0.1µF
1
CH0
20
VDD1
VDD
19
VDD2
10
10µF
.
.
.
VDD3
+2.5V
Analog
Inputs
13
GND
AS1520/
AS1521
CPU
17
I/O
8
CH7
CSN
18
SCK (SK)
MOSI (SO)
MISO (SI)
9
SCLK
16
COM
DIN
14
DOUT
11
REF
15
SSTRB
12
REFADJ
VSS
4.7µF
0.1µF
QSPI Interface
The AS1520/AS1521 can interface with QSPI using the circuit in Figure 34 (fSCLK = 4.0MHz, CPOL = 0, CPHA = 0).
This QSPI circuit can be programmed to do a conversion on each of the eight channels. The result is stored in memory
without affecting CPU performance, since QSPI incorporates a micro-sequencer.
Figure 34. QSPI Interface Connections
+3 or
+5V
1
CH0
20
VDD1
+
0.1µF
10µF
19
VDD2
.
.
.
10
VDD3
+2.5V
Analog
Inputs
13
GND
+3 or
+5V
AS1520/
AS1521
CPU
Power
Supplies
17
CSN
8
PCSO
CH7
18
SCLK
9
SCK
MOSI
MISO
COM
16
DIN
14
DOUT
11
REF
GND
15
12
SSTRB
REFADJ
4.7µF
0.1µF
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