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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:
Bit Range
S12 - S0
S31 - S13
Content
Serial Number
Lot Number
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 OTP shadow register array CRC verification. Reference Section 3.2.1 for de-
tails 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.
3.1.2
Self Test Deflection Register (STDEFL)
This read-only register provides the nominal self test deflection values at ambient temperature. The self test value is a positive
deflection value, measured at the factory, and factory programmed for each device. The minimum stored value ($00) equates to
the minimum deflection specified in Section 2.4 ( Δ ST MIN ), and the maximum stored value ($FF) equates to the maximum deflec-
tion specified in Section 2.4 ( Δ ST MAX ).
Table 4. Self Test Deflection Register
Location
Bit
Address
$04
Register
STDEFL
7
STDEFL[7]
6
STDEFL[6]
5
STDEFL[5]
4
STDEFL[4]
3
STDEFL[3]
2
STDEFL[2]
1
STDEFL[1]
0
STDEFL[0]
When self test is activated, the acceleration reading can be compared to the value in this register. The difference from the
measured deflection value, and the nominal deflection value stored in the register shall not fall outside the self test accuracy limits
specified in Section 2.4 ( Δ ST ACC ). Reference Section 3.6 for more details on calculating the self test Limits.
3.1.3
Factory Configuration Registers
The factory configuration register is a one time programmable, read only registers which contain customer specific device con-
figuration information that is programmed by Freescale.
Table 5. Factory Configuration Register
Location
Bit
Address
$06
Register
FCTCFG
7
1
6
0
5
0
4
0
3
0
2
0
1
0
0
0
MMA655x
Sensor
12
Freescale Semiconductor, Inc.
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