U4221B Datasheet, PDF (10/12 Pages) TEMIC Semiconductors – Radio Controlled Clock Receiver

U4221B
Information Regarding US Transmitter
Station: WWVB
Frequency 60 kHz
Transmitting power 10 kW
Location: Fort Collins
Geographical coordinates: 40_ 40’N, 105_ 03’W
Time of transmission: permanent.
TIME FRAME 1 MINUTE
( index count 1 second)
TIME FRAME
0 5 10 15 20 25 30 35 40 45 50 55 0 5 10
minutes
hours
days
UTI UTI
year
sign correction
daylight savings time bits
leap second warning bit
leap year indicator bit
”0” = non leap year
”1” = leap year
Example: UTC 18.42 h
P0 40 20 10
TIME FRAME
8 4 2 1 P1
93 7529 e
20 10
8 4 2 1 P2
seconds0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
minutes
Frame reference marker
hours
Modulation:
The carrier amplitude is reduced at the beginning of each
second and is restored in 500 ms (binary one) or in 200 ms
(binary zero).
Time Code Format:
It consists of 1 minute time frames. A time frame contains
BCD-coded information of minutes, hours, days and year.
In addition there are 6 position identifier markers (P0 thru
P5) and 1 frame reference marker with reduced carrier
amplitude of 800 ms duration.
10 (12)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 15-May-96