TDA5252G2 Datasheet, PDF (65/86 Pages) Infineon Technologies AG – ASK/FSK 915MHz Wireless Transceiver

Signal
Vcc
Neg. Peak Detector (pin12)
TDA5252 G2
Version 1.1
Application
Data Signal
Threshold (pin14)
2,2ms
0
Pos. Peak Detector (pin13)
Power ON
Power Down
Power ON
Peak Detector Power ON
t
Figure 3-27 Power down mode
PkD_PWDN3.wmf
3.7
Data Valid Detection
In order to detect valid data two criteria must be fulfilled.
One criteria is the data rate, which can be set in register 06h and 07h. The other one is the received
RF power level, which can be set in register 08h in form of the RSSI threshold voltage. Thus for
using the data valid detection FSK modulation is recommended.
Timing for data detection looks like the following. Two settings are possible: „Continuous“ and
„Single Shot“, which can be set by D5 and D6 in register 00H.
Figure 3-28
Data
Sequenzer enables
data detection
Counter Reset
reset
Gate time
Compare with single
TH and latch result
Compare with double
TH and latch result
(Frequency) Window
Count Complete
start of conversion
reset
count
comp.
comp.
ready*
possible start of next conversion
t
t
t
count
t
comp.
t
t
t
Frequ_Detect_Timing_continuous.wmf
Frequency Detection timing in continuous mode
Data Sheet
65
2007-02-26