OM5610 View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
OM5610 Datasheet PDF : 16 Pages
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Philips Semiconductors
Matchbox global FM tuner
Preliminary specification
OM5610
Description of the bus
The OM5610 radio has a bus which consists of three
wires, as shown in Table 1.
Table 1 Bus signals
SIGNAL
CLCK
DATA
WREN
DESCRIPTION
PIN
software driven clock input 4
data input/output
6
write/read-input
3
These three signals, together with the mono/stereo pin
(STEREO; pin 5), communicate with the microcontroller.
The mono/stereo indicator has two functions, which are
controlled by the CLCK, as shown in Table 2.
Table 2 Bus-clock functions
CLCK
LOW
LOW
HIGH
HIGH
STEREO (PIN 5)
RESULT
LOW
stereo
HIGH
mono
LOW
tuned
HIGH
not tuned
The OM5610 has a 25-bit shift register; see Table 3 for an
explanation of the shift register bits.
If in search mode no transmitter can be found, all
frequency bits of the shift register are set to logic 0.
The bus protocol is depicted in Figs 2 and 3 and 4.
Table 3 Explanation of the shift register bits
BIT
S.24 (MSB)
D.23
M.22
B0.21
B1.20
P0.19
P1.18
S0.17
S1.16
15
F.14 to F.0 (LSB)
DESCRIPTION
search start/end
search up/down
mono/stereo
band
band
local/DX
not used
search-level of station
dummy
frequency
LOGIC STATE
RESULT
0
1
0
1
0
1
0
0
0
1
0
see Table 4
after a search when a station is found or after a preset
during the search action
indicates if the radio has to search down
indicates if the radio has to search up
stereo is allowed
mono is required (radio switched to forced mono)
selects FM band
selects FM band
local
DX
determines the locking field strength during a search
operation
0
buffer
−
determine the tuning frequency of the radio;
see Table 5 for the bit values
1997 Apr 25
4
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