U4224B TEMIC Semiconductors, U4224B Datasheet - Page 12

• Manufacturer Part Number: U4224B
• Description: Time Code Receiver
• Manufacturer: TEMIC Semiconductors

Information Regarding German Transmitter
Station: DCF 77,
Frequency 77.5 kHz,
Transmitting power 50 kW
Modulation:
The carrier amplitude is reduced to 25 % at the beginning
of each second for 100 ms (binary zero) or 200 ms (binary
one) duration, excepting the 59th second.
Time Code Format: (based on in-
formation of Deutsche Bundespost)
It consists of 1 minute time frames. No modulation at the
U4224B
sec.
12 (17)
Example:19.35 h
20
s
0
21
1
Start Bit
coding
when
required
22
5
2
10
23
4
24
15
minutes
8
25
20
minutes
10
Time Frame 1 Minute
( index count 1 second )
26
25
20
27
30
hours
40
28
Location: Mainflingen/Germany,
Geographical coordinates: 50 _ 0.1’N, 09 _ 00’E
Time of transmission: permanent
beginning of the 59th second to recognize the switch over
to the next 1 minute time frame. A time frame contains
BCD–coded information of minutes, hours, calendar day,
day of the week, month and year between the 20th second
and 58th second of the time frame, including the start bit
S (200 ms) and parity bits P1, P2 and P3. Further there are
5 additional bits R (transmission by reserve antenna), A1
(announcement of change–over to the summer time), Z1
(during the summer time 200 ms, otherwise 100 ms), Z2
(during standard time 200 ms otherwise 100 ms) and A2
(announcement of leap second) transmitted between the
15th second and 19th second of the time frame.
35
P1
calendar
day
29
40
1
Parity Bit P1
day
of
the
week
30
45
month
2
31
50
TELEFUNKEN Semiconductors
4
hours
32
year
55
8
Parity Bit P2
33
10
0
Rev. A3, 02-Apr-96
34
Time Frame
20
5
35
93 7527
P2
10