U4223B Datasheet, PDF (14/18 Pages) ATMEL Corporation – Time-Code Receiver with A/D Converter

U4223B
Information on the British Transmitter
Station: MSF
Frequency 60 kHz
Transmitting power 50 kW
Location: Teddington, Middlesex
Geographical coordinates: 52_ 22’N, 01_ 11’W
Time of transmission: permanent, except the first
Tuesday of each month from 10.00 h to 14.00 h.
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
year
Switch over to
the next time frame
0
1
500 ms 500 ms
month
day of
month
day
of
hour
week
minute
Parity
check
bits
minute
identifier
BST
hour + minute
day of week
day + month
year
BST 7 GMT change
impending
Example:
March 1993
80 40 20 10 8 4 2 1 10 8
421
seconds 17 ₁₈ 19 ₂₀ 21 ₂₂ 23 ₂₄ 25 ₂₆ 27 _{28 29} 30
year
month
Figure 25.
Modulation
The carrier amplitude is switched off at the beginning of
each second for a period of 100 ms (binary zero) or
200 ms (binary one).
Time-Code Format
The time-code format consists of 1-minute time frames.
A time frame contains BCD–coded information of year,
month, calendar day, day of the week, hours and minutes.
At the switch-over to the next time frame, the carrier
amplitude is switched off for a period of 500 ms.
The prescence of the fast code during the first 500 ms at
the beginning of the minute in not guaranteed. The trans-
mission rate is 100 bits/s and the code contains
information of hour, minute, day and month.
14 (18)
Rev. A7, 06-Mar-01