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| 型号： | CME8000-DDTB |
| 厂商： | C-Max |
| 文件页数： | 10/22页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER RC BICMOS DIE |
| 标准包装： | 1,000 |
| 功能： | 接收器 |
C-MAX Time Solutions
9
Protocol recognition
Data Sheet
CME8000
To get a fast information of the received protocol, after every power on the received signal will be compared
with the chosen protocol. The bit stream is checked for pulses with characteristically pulse duration.
To start a new protocol recognition it is necessary to reset via PON.
Three bits are output on Data_Out pin when the protocol is detected. Output on Data_Out pin is specified in
the table “Logical function of SS1, SS2” (page 9).
WWVB is designed such that when S1, S2 selected WWVB, CME8000 scans automatically in parallel the 3
possibilities in JJY, WWVB and MSF. Once protocol identified is not WWVB, user should switch to its correct
protocol setting and confirm once again on the correct setting in 60kHz.
10
Bit Strength Indicator
Refresh rate: Information will be refreshed every second
Output as binary digital output on BSI1 and BSI2
BSI1
BSI2
Level
1
0
1
1
3
2
Near 100% correct bits
Some bit error, but still decodable
More bit errors, can try to decode, incorrect information
1
0
0
0
1
0
possible
Decoding impossible
Bit strength indication
The pins BSI2 and BSI1 are the output pins for the bit strength indication with 4 levels. The bit strength
indication is only influenced by the quality of the received bit and not of the field strength.
The bit strength indication starts after every power on at 0. So the outputs will be updated every second.
SPEC No.
CME8000
Revision
B.15
State
09.03.07
C-MAX printed
03.05.2007
Version
English
Page
10 of 22
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