T2803 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'T2803' PDF : 28 Pages View PDF
Table 4-2. Control Signals – Modes
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
Reference counter
Typical current consumption at VS = 3.2V
TX Mode
1
1
1
1
0
1
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
56 mA
RX Mode
1
1
1
1
1
0
ON
ON
ON
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
85 mA
RSSI Only
1
1
1
1
1
1
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
82 mA
5. Serial Programming Bus
The transceiver is programmed by the 3-wire bus (CLOCK, DATA and ENABLE).
After 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 condi-
tion, the bus current is increased to speed up the bus logic.
The programming of the transceiver is separated into two data words. Data word 1 controls
mainly the channel information together with settings, which are closely related with the channel.
Data word 2 holds setup information, which is adjusted during production.
16 T2803
4572I–DECT–07/05
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