AK8975 Datasheet, PDF (6/34 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

4.3. Pin Function

Pin No.
Pin
I/O
75 75C ^name
1
A1 TST1 O
2
A2 CSB
I
3
A4 RSV
I
SCL
4
A3
I
SK
SDA I/O
5
D4
SI
I
6
B4
SO
O
7
C4
VID
-
8
-
NC1
9
B3 TST6 O
10 C3 DRDY O
11 D2 CAD1
I
[AK8975/C]
Power
supply
system
VDD
VID
VID
VID
VID
VID
-
VID
VID
VDD
Type
Function
ANALOG
CMOS
Test pin.
Hi-Z output. Keep this pin electrically nonconnected.
Chip select pin for 4-wire SPI.
“L” active. Connect to VID when selecting I²C bus interface.

CMOS
CMOS
CMOS
CMOS
Reserved pin.
Keep this pin electrically nonconnected or connect to VSS.
When the I²C bus interface is selected (CSB pin is connected to
VID)
SCL: Control data clock input pin
Input: Schmidt trigger
When the 4-wire SPI is selected
SK: Serial clock input pin
When the I²C bus interface is selected (CSB pin is connected to VID)
SDA: Control data input/output pin
Input: Schmidt trigger, Output: Open drain
When the 4-wire SPI is selected
SI: Serial data input pin
When the I²C bus interface is selected (CSB pin is connected to VID)
Hi-Z output. Keep this pin electrically nonconnected.
When the 4-wire SPI is selected
Serial data output pin
Power Digital interface positive power supply pin.
CMOS
CMOS
CMOS
Non-contact pin.
Keep this pin electrically nonconnected.
Test pin.
Vss output. Keep this pin electrically nonconnected or connect to
VSS..
Data ready signal output pin.
Active “H”. Informs measurement ended and data is ready to be
read.
When the I²C bus interface is selected (CSB pin is connected to VID)
CAD1: Slave address 1 input pin
Connect to VSS or VDD.
When the 4-wire serial interface is selected
Connect to VSS.
12
-
NC2
13 D1 CAD0
I
14 C2 TST2 O
15 C1 VSS
-
16 B1 VDD
-
VDD
VDD
-
-
Non-contact pin. Keep this pin electrically nonconnected.
CMOS
ANALOG
When the I²C bus interface is selected (CSB pin is connected to VID)
CAD0: Slave address 0 input pin
Connect to VSS or VDD.
When the 4-wire serial interface is selected
Connect to VSS.
Test pin.
Hi-Z output. Keep this pin electrically nonconnected.
Power Ground pin.
Power Analog Power supply pin.
MS1187-E-02
-6-
2010/05