tda5251f1 Infineon Technologies Corporation, tda5251f1 Datasheet - Page 30

• Manufacturer Part Number: tda5251f1
• Description: Ask/fsk 315mhz Wireless Transceiver
• Manufacturer: Infineon Technologies Corporation

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2.4.16
Figure 2-9
Table 2-28
SLAVE MODE: The receive and transmit operation is fully controlled by an external control device
via the respective RxTx, AskFsk, PwdDD, and Data pins. The wakeup logic is inactive in this case.
After RESET or 1
CONFIG register the mode may be changed.
SELF POLLING MODE: The chip turns itself on periodically to receive using a built-in 32kHz RC
oscillator. The timing of this is determined by the ON_TIME and OFF_TIME registers, the duty cycle
can be set between 0 and 100% in 31.25µs increments. The data detect logic is enabled and a 15µs
LOW impulse is provided at PwdDD pin (Pin 27), if the received data is valid.
Figure 2-10
Preliminary Specification
MODE_1
SELF POLLING MODE
0
0
1
Wakeup Logic
MODE settings: CONFIG register
PwdDD pin in
Wakeup Logic States
Timing for Self Polling Mode (ADC & Data Detect in one shot mode)
st
Power-up the chip is in SLAVE MODE. By setting MODE_1 and MODE_2 in the
Action
S E L F P O L L IN G
MODE_2 = X
MODE_1 = 1
MODE_2
M O D E
0
1
X
min. 2.6ms
RX ON: valid Data
ON_TIME
S L A V E M O D E
MODE_1 = 0
MODE_2 = 0
(d e fa ult)
15µs
30
OFF_TIME
T IM E R M O D E
SELF POLLING MODE
MODE_1 = 0
MODE_2 = 1
SLAVE MODE
TIMER MODE
Mode
RX ON: invalid Data
ON_TIME
Functional Description
TDA5251 F1
Version 1.0
timing_selfpllmode.wmf
2003-02-18
t
3_modes.wmf
t