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AK5554VN Datenblatt(PDF) 56 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) 56 Page - Asahi Kasei Microsystems

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[AK5554]
015099864-E-00
2016/03
- 56 -
Operation Mode Control
Operation modes of the AK5554 are set by pins or registers. In parallel mode, the operation mode is set
by pin and register settings are invalid. Therefore the functions that needs register settings are not
available in parallel mode. For register accessing, 3-wire serial and I
2C bus communications are
available. This control mode of the AK5554 is selected by the I2C pin and the PSN pin. In serial control
mode, register settings are prioritized so that all pin settings except the MSN pin setting are ignored.
I2C pin
PSN pin
Control Mode
L
L
3-wire Serial
L
H
3-wire Serial
H
L
I2C Bus
H
H
Parallel
Table 22. Control Mode
Register Control Interface
(1) 3-wire Serial Control mode (I2C pin
= “L”)
The internal registers may be written through the 3-wire µP interface pins (CSN, CCLK and CDTI).
The data on this interface consists of a 2-
bit Chip address, Read/Write (1bit, Fixed to “1”, Write only),
Register address (MSB first, 5bits) and Control data (MSB first, 8bits). Address and data are clocked
in on the rising edge of CCLK and data is clocked out on the falling edge. For write operations, data
is latched after a low-to-high transition of CSN. The clock speed of CCLK is 5MHz (max).
The in
ternal registers are initialized by setting the PDN pin = “L”. In serial mode, an internal timing
circuit is reset by setting RSTN bit = “0” but register values are not initialized.
CDTI
CCLK
C1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
D4
D5
D6
D7
A1
A2
A3
A4
R/W
C0
A0
D0
D1
D2
D3
CSN
C1-C0: Chip Address (C1=CAD1, C0=CAD0)
R/W:
READ/WRITE (Fixed to “1”, Write only)
A4-A0: Register Address
D7-D0: Control Data
Figure 62. Control I/F Timing
* The AK5554 does not support read commands in 3-wire serial control mode.
* When the AK5554 is in power down mode
(PDN pin = “L”), a writing into the control registers is
prohibited.
* The control data cannot be written when the CCLK rising edge is 15 times or less, or 17 times or more
during CSN is “L”.


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