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Pin Connections
16 15 14 13
V REGA 1
V SS 2
V REG 3
V SS 4
17
12 CS
11 MOSI
10 SCLK
9 V CC
5
6
7
8
Figure 4. 16-Pin QFN Package, Top View
Table 2. Pin Description
Pin
1
2
3
4
5
Pin
Name
V REGA
V SS
V REG
V SS
N/C
Formal Name
Analog
Supply
Digital GND
Digital
Supply
Digital GND
No Connect
Definition
This pin is connected to the power supply for the internal analog circuitry. An external capacitor must be
connected between this pin and V SSA . Reference Figure 1 .
This pin is the power supply return node for the digital circuitry.
This pin is connected to the power supply for the internal digital circuitry. An external capacitor must be
connected between this pin and V SS . Reference Figure 1 .
This pin is the power supply return node for the digital circuitry.
No Connection
The function of this pin is configurable via the DEVCFG register as described in Section 3.1.6.5 . When the
6
ARM/
PCM
Arm Output /
PCM Output
arming output is selected, ARM can be configured as an open drain, active low output with a pullup current; or
an open drain, active high output with a pulldown current. Alternatively, this pin can be configured as a digital
output with a PCM signal proportional to the acceleration data. Reference Section 3.8.9 and Section 3.8.10 . If
unused, this pin must be left unconnected.
7
8
TEST/
V PP
MISO
Programming This pin provides the power for factory programming of the OTP registers. This pin must be connected to V SS
Voltage in the application.
SPI Data Out This pin functions as the serial data output for the SPI port.
9
10
11
12
V CC
SCLK
MOSI
CS
Supply
SPI Clock
SPI Data In
Chip Select
This pin supplies power to the device. An external capacitor must be connected between this pin and V SS .
Reference Figure 1 .
This input pin provides the serial clock to the SPI port. An internal pulldown device is connected to this pin.
This pin functions as the serial data input to the SPI port. An internal pulldown device is connected to this pin.
This input pin provides the chip select for the SPI port. An internal pullup device is connected to this pin.
13
V SSA
Analog GND This pin is the power supply return node for analog circuitry.
14
15
N/C
N/C
No Connect
No Connect
No Connection
No Connection
16
V SSA
Analog GND This pin is the power supply return node for analog circuitry.
17
PAD
Die Attach
Pad
This pin is the die attach flag, and is internally connected to V SS .
Corner
Pads
Corner Pads The corner pads are internally connected to V SS .
MMA685x
Sensors
4
Freescale Semiconductor, Inc.
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