at88rf1354 ATMEL Corporation, at88rf1354 Datasheet - Page 34

• Manufacturer Part Number: at88rf1354
• Description: 13.56 Mhz Type B Rf Reader Specification
• Manufacturer: ATMEL Corporation

C.2.
34
13.56 MHz Type B RF Reader
TWI Device Address
The TWI device address is selected with the ADDR address select pin of the AT88RF1354.
Figure C-2. TWI Device Address
The AT88RF1354 device requires an 8-bit device address word following a start condition to enable the chip for a
read or write operation. The device address word consists of a 7 bit address followed by a read/write select bit. The
write bit should be set when sending command packets to AT88RF1354. The read bit should be set when retrieving
response packets from AT88RF1354.
Upon a successful compare of the device address, the AT88RF1354 will pull the SDI output low for 1 bit period,
sending a TWI ACK bit. If an address compare is unsuccessful, the device will return to an idle state and the SDA /
SDI line will remain pulled up by the external pull-up resistor, effectively sending a TWI NACK bit.
The AT88RF1354 ignores TWI communication packets that do not begin with a matching device address. This allows
other TWI devices to share the bus with the AT88RF1354 reader IC.
ADDR Pin
V
V
CC
SS
Bit 6
0
1
Bit 5
1
1
Bit 4
0
0
TWI Device Address
All other values are NOT supported
Bit 3
1
1
Bit 2
0
0
Bit 1
0
1
Bit 0
0
0
TWI_R
$D5
$51
TWI_W
8547A−RFID−10/08
$D4
$50