Sensors

Freescale Semiconductor, Inc.

13

MMA16xxKW

3

Functional Description

3.1

User Accessible Data Array

A user accessible data array allows for each device to be customized. The array consists of an OTP factory programmable

array, an OTP user programmable array, and read-only registers for device status. The OTP arrays incorporate independent CRC

circuitry for fault detection (reference Section 3.2). Portions of the factory programmable array are reserved for factory-pro-

grammed trim values. The user accessible data is shown in the table below.

Type codes

F:

Freescale programmed OTP locationU/F:User and/or Freescale programmed OTP location.

R:

Read-only registerU:User Programmed OTP location.

Note: Unused and Unprogrammed Spare bits always read ‘0’.

3.1.1

Device Serial Number Registers

A unique serial number is programmed into the serial number registers of each device during manufacturing. The serial num-

ber is composed of the following information:

Serial numbers begin at 1 for all produced devices in each lot, and are sequentially assigned. Lot numbers begin at 1 and are

sequentially assigned. No lot will contain more devices than can be uniquely identified by the 13-bit serial number. Depending on

lot size and quantities, all possible lot numbers and serial numbers may not be assigned.

The serial number registers are included in the factory programmed OTP CRC verification. Reference Section 3.2.1 for details

regarding the CRC verification. Beyond this, the contents of the serial number registers have no impact on device operation or

performance, and are only used for traceability purposes.

Table 2. User Accessible Data

Byte

Addr

RA[3:0]

Register

Nibble Addr

WA[3:0]

Bit Function

Nibble Addr

(WA[3:0])

Bit Function

Type

7

6

5

4

3

2

1

0

$00

SN0

SN[7]

SN[6]

SN[5]

SN[4]

SN[3]

SN[2]

SN[1]

SN[0]

F

$01

SN1

SN[15]

SN[14]

SN[13]

SN[12]

SN[11]

SN[10]

SN[9]

SN[8]

$02

SN2

SN[23]

SN[22]

SN[21]

SN[20]

SN[19]

SN[18]

SN[17]

SN[16]

$03

SN3

SN[31]

SN[30]

SN[29]

SN[28]

SN[27]

SN[26]

SN[25]

SN[24]

$04

TYPE

Reference

Table 39

LPF[1]

LPF[0]

0

0

Reference

Table 39

RNG[3]

RNG[2]

RNG[1]

RNG[0]

U/F

$05

DEVCFG

DEVID

UNUSED

UNUSED

UNUSED

UNUSED

CRC_U[2]

CRC_U[1]

CRC_U[0]

$06

DEVCFG1

UD00[5]

UD00[4]

UD00[3]

UD00[2]

UD00[1]

UD00[0]

AT_OTP[1] AT_OTP[0]

$07

DEVCFG2

LOCK_U

UNUSED

PCM

RESERVED

ADDR[3]

ADDR[2]

ADDR[1]

ADDR[0]

$08

UD01

UD01[7]

UD01[6]

UD01[5]

UD01[4]

UD01[3]

UD01[2]

UD01[1]

UD01[0]

$09

UD02

UD02[7]

UD02[6]

UD02[5]

UD02[4]

UD02[3]

UD02[2]

UD02[1]

UD02[0]

$0A

UD03

UD03[7]

UD03[6]

UD03[5]

UD03[4]

UD03[3]

UD03[2]

UD03[1]

UD03[0]

$0B

UD04

UD04[7]

UD04[6]

UD04[5]

UD04[4]

UD04[3]

UD04[2]

UD04[1]

UD04[0]

$0C

UD05

UD05[7]

UD05[6]

UD05[5]

UD05[4]

UD05[3]

UD05[2]

UD05[1]

UD05[0]

$0D

UD06

UD06[7]

UD06[6]

UD06[5]

UD06[4]

UD06[3]

UD06[2]

UD06[1]

UD06[0]

$0E

UD07

UD07[7]

UD07[6]

UD07[5]

UD07[4]

UD07[3]

UD07[2]

UD07[1]

UD07[0]

$0F

UD08

UD08[7]

UD08[6]

UD08[5]

UD08[4]

UD08[3]

UD08[2]

UD08[1]

UD08[0]

Bit Range

Content

SN[12:0]

Serial Number

SN[31:13]

Lot Number