U4223B ATMEL Corporation, U4223B Datasheet - Page 13
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
U4223B
Manufacturer Part Number
U4223B
Description
Time-code Receiver With A/d Converter
Manufacturer
ATMEL Corporation
Datasheet
1.U4223B.pdf
(18 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
U4223B-MFSG3
Manufacturer:
TI
Quantity:
159
Rev. A7, 06-Mar-01
Information on the 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 a period of 100 ms (binary zero) or
200 ms (binary one), except the 59th second.
Time-Code Format (based on
Information of Deutsche Bundespost)
The time-code format consists of 1-minute time frames.
There is no modulation at the beginning of the 59th
second to indicate the switch over to the next 1-minute
seconds
Example:19.35 h
20
0
s
21
5
coding
when
required
1
Start Bit
22
10
2
23
15
4
24
minutes
20
8
minutes
Time frame 1 minute
25
( index count 1 second )
25
10
26
Figure 24.
30
20
hours
27
Location: Mainflingen/Germany,
Geographical coordinates: 50_ 0.1’N, 09_ 00’E
Time of transmission: permanent
time frame. A time frame contains BCD-coded infor-
mation 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. Furthermore, there are 5 addi-
tional bits R (transmission by reserve antenna), A1
(announcement of change-over to summer time), Z1 (dur-
ing 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.
40
35
28
calendar
day
P1
40
29
day
of
the
week
1
Parity Bit P1
45
30
month
2
31
50
year
4
hours
32
55
8
Parity Bit P2
33
U4223B
0
10
34
Time frame
5
20
35
13 (18)
10
P2