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AK5554VN Datenblatt(PDF) 57 Page - Asahi Kasei Microsystems

Teilenummer AK5554VN
Bauteilbeschribung  4-Channel Differential 32-bit ADC
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Hersteller  AKM [Asahi Kasei Microsystems]
Direct Link  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AK5554VN Datenblatt(HTML) 57 Page - Asahi Kasei Microsystems

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[AK5554]
015099864-E-00
2016/03
- 57 -
(2) I
2C-bus Control mode (I2C pin = “H” and PSN pin = “L”)
The AK5554 supports the fast-mode I
2C-bus (max: 400 kHz, Ver1.0).
(2)-1. WRITE Operations
Figure 63 shows the data transfer sequence of the I
2C-bus mode. All commands are preceded by a
START condition. A HIGH to LOW transition on the SDA line while SCL is HIGH indicates a START
condition (Figure 69). After the START condition, a slave address is sent. This address is 7 bits long
followed by the eighth bit that is a data direction bit (R/W). The most significant five bits of the slave
address are fixed as “00100”. The next bits are CAD1-0 (device address bits). This bits identifies the
specific device on the bus. The hard-wired input pins (CAD1-0 pins) set these device address bit (Figure
64). If the slave address matches that of the AK5554, the AK5554 generates an acknowledge and the
operation is executed. The master must generate the acknowledge-related clock pulse and release the
SDA line (HIGH) during the acknowledge clock pulse (Figure 70
). R/W bit = “1” indicates that the read
operation is to be executed. “0” indicates that the write operation is to be executed.
The second byte consists of the control register address of the AK5554. The format is MSB first, and
those most significant 3-bits are fixed to zeros (Figure 65). The data after the second byte contains
control data. The format is MSB first, 8bits (Figure 66). The AK5554 generates an acknowledge after
each byte is received. Data transfer is always terminated by a STOP condition generated by the master.
A LOW to HIGH transition on the SDA line while SCL is HIGH defines STOP condition (Figure 69).
The AK5554 can perform more than one byte write operation per sequence. After receipt of the third byte
the AK5554 generates an acknowledge and awaits the next data. The master can transmit more than
one byte instead of terminating the write cycle after the first data byte is transferred. After receiving each
data packet the internal 6-bit address counter is incremented by one, and the next data is automatically
taken into the next address. If the address exceeds
“07H” prior to generating a stop condition, the
address counter will “roll over” to “00H” and the previous data will be overwritten.
The data on the SDA line must remain stable during the HIGH period of the clock. The HIGH or LOW
state of the data line can only change when the clock signal on the SCL line is LOW (Figure 71) except
for the START and STOP conditions.
3rd byte
2nd byte
1st byte
SDA
S
T
A
R
T
A
C
K
A
C
K
S
Slave
Address
A
C
K
Sub
Address(n)
Data(n)
P
S
T
O
P
Data(n+x)
A
C
K
Data(n+1)
A
C
K
R/W=
“0”
A
C
K
Figure 63. Data Transfer Sequence at the I
2C-Bus Mode
0
0
1
0
0
CAD1
CAD0
R/W
(CAD0 and CAD1 are set by pins)
Figure 64. The First Byte
0
0
0
A4
A3
A2
A1
A0
Figure 65. The Second Byte
D7
D6
D5
D4
D3
D2
D1
D0
Figure 66. Byte Structure After The Second Byte


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