MMA5124KW datasheet(13/55 Pages) FREESCALE

13 / 55 page

Sensors

Freescale Semiconductor, Inc.

MMA51xxKW

3.1.2

Factory Configuration Register (DEVCFG1)

The factory configuration register is a factory programmed, read only register which contains user specific device configuration

information. The factory configuration register is included in the factory programmed OTP CRC verification.

3.1.2.1

Range Indication Bits (RNG[2:0])

The range indication bits are factory programmed and indicate the full-scale range of the device as shown below.

3.1.3

Device Configuration 2 Register (DEVCFG2)

Device configuration register 2 is a user programmable OTP register that contains device configuration information.

3.1.3.1

User Configuration Lock Bit (LOCK_U)

The LOCK_U bit allows the user to prevent writes to the user configuration array once programming is completed.

If the LOCK_U bit is written to ‘1’ when a PSI5 “Execute Programming of NVM” command is executed, the LOCK_U OTP bit

will be programmed. Upon completion of the OTP programming, an OTP readout will be executed, locking the array from future

OTP writes. The User Programmable OTP Array CRC Verification is also activated (Reference Section 3.2.2).

3.1.3.2

PCM Enable Bit (PCM)

The PCM bit enables the PCM output pin. When the PCM bit is set, the PCM output pin is active and outputs a Pulse Code

Modulated signal proportional to the acceleration response. Reference Section 3.5.3.7 for more information regarding the PCM

output. When the PCM bit is cleared, the PCM output pin is actively pulled low.

Location

Bit

Address

6543210

$04

DEVCFG1

0101

RNG[2]

RNG[1]

RNG[0]

Factory Default

0100000

RNG[2]

RNG[1]

RNG[0]

Full-Scale Acceleration

Range

g-Cell Design

PSI5 Init Data

Transmission (D9)

Reference Table 12

Reserved

N/A

0001

±60g

Medium-g

0111

Reserved

N/A

0010

±120g

Medium-g

1000

Reserved

N/A

0011

±240g

High-g

1001

Reserved

N/A

0100

±480g

High-g

1010

Location

Bit

Address

$05

DEVCFG2

LOCK_U

PCM

SYNC_PD

LATENCY

DATASIZE

BLANKTIME

P_CRC

BAUD

Factory Default

000

00000

PCM

PCM Output

Actively Pulled Low

PCM Signal Enabled

MMA5124KW Datasheet(PDF) 13 Page - Freescale Semiconductor, Inc

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