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參數(shù)資料
| 型號(hào)： | TDA7427D |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 通用總線功能 |
| 英文描述： | AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER |
| 中文描述： | 上午- FM收音機(jī)頻率合成器和中頻計(jì)數(shù)器 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 144K |
| 代理商： | TDA7427D |
dress beingtransmitted.
After this comparison, the TDA7427 will generate
an ”acknowledge” on the SDA line and will per-
form either a read or write operationaccording to
the state of R/Wbit.
Write Operation
Following a START conditionthe master sends a
slave address word with the R/W bit set to ”0”.
The TDA7427 will ”acknowledge” after this first
transmission and wait for a second word (the
word addressfield).
This 8 bit address field provides an access to any
of the 8 internal addresses. Upon receipt of the
word address the TDA7427 slave device will re-
spond with an ”acknowledge”. At this time, all the
following words transmitted to the TDA7427 will
be considered as Data. The internal address will
be automaticallyincremented.After each word re-
ceipt the TDA7427 will answer with an ”acknow-
ledge”.
SOFTWARE SPECIFICATION
I
2
C Protocol
The interfaceprotocol comprises:
A startcondition (s)
A chip address byte (the LSB determines
read/writetransmission)
A sub-addressbyte.
A sequenceof data (N-bytes + acknowledge)
A stopcondition (P)
CHIP ADDRESS
MSB
1
LSB
0
1
0
0
0
1
0
SUBADDRESS
MSB
T3
LSB
A0
0
1
0
1
0
1
0
1
0
1
0
1
FUNCTION
T2
T1
I
A3
0
0
0
0
0
0
0
0
1
1
1
1
A2
0
0
0
0
1
1
1
1
0
0
0
0
A1
0
0
1
1
0
0
1
1
0
0
1
1
Charge pump control
PLL counter 1 (LSB)
PLL counter 2 (MSB)
PLL reference counter 1 (LSB)
PLL reference counter 2 (MSB)
PLL lockdetector control and PLL modeselect
IFC reference counter 1 (LSB)
IFCreference counter 2 (MSB)andIFCmodeselect
IF counter control 1
IF counter control 2
Oscillator adjust
Port extension
page mode off
page mode enabled
0
1
T1, T2, T3 used for testing,in application mode they have to be ”0”
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
1
LSB
R/W
ACK
T
MSB
LSB
MSB
LSB
S
1
0
0
0
1
0
T
T
I
A3 A2 A1 A0
ACK
DATA
ACK
P
ACK = Acknowledge
S = Start
P = Stop
I = AutoIncrement
T = usedfor testing(in applicationmode they have to be ” 0”)
MAXCLOCK SPEED 400kbits/s
TDA7427
12/21
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