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AS3932
Datasheet - D e t a i l e d D e s c r i p t i o n
8.2.3
Serial Data Interface (SDI)
This 4-wires interface is used by the Microcontroller (μC) to program the AS3932. The maximum clock frequency of the SDI is 2MHz.
Table 8. Serial Data Interface (SDI) pins
Name
CS
SDI
SDO
SCLK
Signal
Digital Input with pull down
Digital Input with pull down
Digital Output
Digital Input with pull down
Signal Level
CMOS
CMOS
CMOS
CMOS
Description
Chip Select
Serial Data input for writing registers, data to
transmit and/or writing addresses to select
readable register
Serial Data output for received data or read
value of selected registers
Clock for serial data read and write
Note: SDO is set to tristate if CS is low. In this way more than one device can communicate on the same SDO bus.
SDI Command Structure. To program the SDI the CS signal has to go high. A SDI command is made up by a two bytes serial command and
the data is sampled on the falling edge of SCLK. The Table 9 shows how the command looks like, from the MSB (B15) to LSB (B0). The
command stream has to be sent to the SDI from the MSB (B15) to the LSB (B0).
Table 9. SDI Command Structure
Mode
Register address / Direct Command
Register Data
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
The first two bits (B15 and B14) define the operating mode. There are three modes available (write, read, direct command) plus one spare (not
used), as shown in Table 10 .
Table 10. SDI Command Structure
B15
0
0
1
1
B14
0
1
0
1
Mode
WRITE
READ
NOT ALLOWED
DIRECT COMMAND
In case a write or read command happens the next 6 bits (B13 to B8) define the register address which has to be written respectively read, as
shown in Table 11 .
Table 11. SDI Command Structure
B13
0
0
0
0
0
0
0
0
0
0
B12
0
0
0
0
0
0
0
0
0
0
B11
0
0
0
0
0
0
0
0
1
1
B10
0
0
0
0
1
1
1
1
0
0
B9
0
0
1
1
0
0
1
1
0
0
B8
0
1
0
1
0
1
0
1
0
1
Read/Write register
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
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