TDA7427AD1 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TDA7427AD1 Datasheet PDF : 21 Pages
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TDA7427A
dress being transmitted.
After this comparison, the TDA7427A will gener-
ate an "acknowledge" on the SDA line and will
perform either a read or write operation according
to the state of R/W bit.
Write Operation
Following a START condition the master sends a
slave address word with the R/W bit set to "0".
The TDA7427A will "acknowledge" after this first
transmission and wait for a second word (the
word address field).
This 8 bit address field provides an access to any
of the 8 internal addresses. Upon receipt of the
word address the TDA7427A slave device will re-
spond with an "acknowledge". At this time, all the
following words transmitted to the TDA7427A will
be considered as Data. The internal address will
be automatically incremented. After each word re-
ceipt the TDA7427A will answer with an "acknow-
ledge".
SOFTWARE SPECIFICATION
I2C Protocol
The interface protocol comprises:
A start condition (s)
A chip address byte (the LSB determines
read/write transmission)
A sub-address byte.
A sequence of data (N-bytes + acknowledge)
A stop condition (P)
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
S11000
LSB MSB
LSB MSB
C R/W ACK T T T I A3 A2 A1 A0 ACK
ACK = Acknowledge
S = Start
P = Stop
I = Auto Increment
C = chip select
T = used for testing (in application mode they have to be " 0")
MAX CLOCK SPEED 400kbits/s
DATA
CHIP ADDRESS
MSB
LSB
FUNCTION
1
1
0
0
0
1
C
1
0
ADDR pin open
1
ADDR pin connected to VDD
LSB
ACK P
SUBADDRESS
MSB
T3
T2
T1
I
A3
A2
A1
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
0
1
T1, T2, T3 used for testing, in application mode they have to be "0"
12/21
LSB
A0
0
1
0
1
0
1
0
1
0
1
0
1
FUNCTION
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 mode select
IFC reference counter 1 (LSB)
IFC reference counter 2 (MSB) and IFC mode select
IF counter control 1
IF counter control 2
Oscillator adjust
Port extension
page mode off
page mode enabled
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