AS3932-BTST austriamicrosystems, AS3932-BTST Datasheet - Page 16

• Manufacturer Part Number: AS3932-BTST
• Description: IC RF PROGRAM 16-TSSOP
• Manufacturer: austriamicrosystems

Specifications of AS3932-BTST

• Rf Type: Read / Write
• Frequency: 110kHz ~ 150kHz
• Features: RSSI Equipped
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS3932-BTSTTR

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
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.
the data is sampled on the falling edge of SCLK. The
command stream has to be sent to the SDI from the MSB (B15) to the LSB (B0).
Table 9. SDI Command Structure
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. SDI Command Structure
In case a write or read command happens the next 5 bits (B13 to B9) define the register address which has to be written respectively read, as
shown in
Table 11. SDI Command Structure
www.austriamicrosystems.com/LF-Receiver/AS3932
B15
B13
Mode
0
0
0
0
0
0
0
0
0
0
Name
SCLK
Table
SDO
SDI
CS
B14
11.
B15
0
0
1
1
Table
B13
B12
0
0
0
0
0
0
0
0
0
0
10.
Register address / Direct Command
B12
To program the SDI the CS signal has to go high. A SDI command is made up by a two bytes serial command and
Digital Input with pull down
Digital Input with pull down
Digital Input with pull down
B11
0
0
0
0
0
0
0
0
1
1
B11
Digital Output
Signal
B10
B14
B10
Table 9
0
1
0
1
0
0
0
0
1
1
1
1
0
0
B9
shows how the command looks like, from the MSB (B15) to LSB (B0). The
B8
B9
Revision 1.4
0
0
1
1
0
0
1
1
0
0
B7
Signal Level
CMOS
CMOS
CMOS
CMOS
B8
B6
0
1
0
1
0
1
0
1
0
1
B5
DIRECT COMMAND
Serial Data input for writing registers, data to
Serial Data output for received data or read
transmit and/or writing addresses to select
NOT ALLOWED
Register Data
B4
Clock for serial data read and write
WRITE
READ
Mode
value of selected registers
Read/Write register
B3
readable register
Description
Chip Select
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
B2
B1
16 - 36
B0