T2802 ATMEL [ATMEL Corporation], T2802 Datasheet - Page 16

• Manufacturer Part Number: T2802
• Description: 2.4 GHz WDECT/ISM SINGLE-CHIP TRANSCEIVER
• Manufacturer: ATMEL [ATMEL Corporation]

Table 3. Control Signals — Modes
Serial Programming Bus
16
Modes
PU_REG
PU_VCO
PU_RX/TX
PU_PLL
RX_ON
TX_ON
BB filter
Demodulator
IF amplifiers and RSSI
IR mixer
RX switch
TX switch
TX driver
Ramp generator
Programmable counter
Voltage-controlled oscillator
Gaussian filter
Phase detector/charge pump
Modulation compensation circuit
Reference counter
Typical current consumption at V
T2802
S
= 3.2 V
The transceiver is programmed by the 3-wire bus (CLOCK, DATA and ENABLE).
After the setting enable signal to low condition on the rising edge of the clock signal, the
data is transferred bit by bit into the shift register, starting with the MSB-bit. When the
enable signal has returned to high condition, the programmed information is loaded into
the addressed latches according to the address bit condition (last bit). Additional leading
bits are ignored and there is no check made how many pulses arrived during enable low
condition. During enable low condition the bus current is increased to speed up the bus
logic.
To keep all information in the registers during standby, DATA_HOLD must be set to high
condition. In this case the power-down current is below 100 µA.
The programming of the transceiver is separated into two data words. Data word 1 con-
trols mainly the channel information together with settings, which are closely related with
the channel. Dataword 2 holds setup information, which is adjusted during production.
TX Mode
58 mA
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
1
1
1
1
0
1
RX Mode
85 mA
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
1
1
1
1
1
0
RSSI Only
4509F–DECT–10/03
82 mA
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
1
1
1
1
1
1