tda5255e1 Infineon Technologies Corporation, tda5255e1 Datasheet - Page 66

• Manufacturer Part Number: tda5255e1
• Description: Ask/fsk 434mhz Wireless Transceiver
• Manufacturer: Infineon Technologies Corporation

Confidential
Figure 3-29
Figure 3-30
3.7
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.
Preliminary Specification
Vcc
Signal
0
Power ON
Data Valid Detection
Peak detector - power down mode
Power down mode
Data
Filter
Neg. Peak Detector (pin12)
Pos. Peak Detector (pin13)
Threshold (pin14)
Power Down
Power Down Mode
Logic
off
off
Detector
Detector
+ Peak
- Peak
66
Power ON
R2
R1
2,2ms
100k
100k
Vcc
SLC
PDP
13
14
PDN
12
Peak Detector Power ON
Data Signal
Vcc
0V
Vcc
C
C
P
N
TDA5255 E1
Version 1.1
Application
PkD_PWDN3.wmf
2002-11-28
PKD_PWDN.wmff
t