Sensors
NXP Semiconductors 43
MMA16xx
4.2.1.15 DSI Command #14
DSI Command ‘1110’ is not implemented. The device ignores all command formats with a command ID of ‘1110’.
4.2.1.16 Reverse Initialization Command
The Reverse Initialization Command is not implemented. The device ignores all command formats with a command ID of
‘1111’. The device ignores all command received on the BUSOUT pin.
4.3 Exception Handling
Table 60 summarizes the exception conditions detected by the device and the response for each exception.
Table 60. Exception Handling
Condition
Description S ST U Response
Exception
Self-Test
Request
Power On
Reset
N/A
Power Applied
Clear Command
1 1 0 – Reference Section 3.6
V
REG
Under-Voltage
N/A V
REG
< V
PORCREG_f
– Device held in Reset.
– No response to DSI commands.
– Bus switch open within t
BSOPEN
.
– Device must be re-initialized when V
REG
returns above V
PORCREG_r
V
REGA
Under-Voltage
N/A V
REGA
< V
PORCREG_f
– Device held in Reset.
– No response to DSI commands.
– Bus switch open within t
BSOPEN
.
– Device must be re-initialized when V
REGA
returns above V
PORCREGA_r
V
HCAP
Under-Voltage
Transient
Disabled
V
HCAP
< V
PORCREG_f
for less
than t
HCAP_POR
, ST Disabled
001
– DSI Read Acceleration Data Short response = zero.
– DSI Read Acceleration Data Long response = normal.
– Device does not need to be re-initialized if V
HCAP
returns above
V
PORHCAP_r
before t
HCAP_POR
Enabled
V
HCAP
< V
PORCREG_f
for less
than t
HCAP_POR
, ST Enabled
011
– DSI Read Acceleration Data Short response = self-test data.
– DSI Read Acceleration Data Long response = self-test data.
– Device does not need to be re-initialized if V
HCAP
returns above
V
PORHCAP_r
before t
HCAP_POR
V
HCAP
Under-Voltage
N/A
V
HCAP
< V
PORCREG_f
for longer
than t
HCAP_POR
– Device is Reset and will continue to Reset every t
HCAP_POR
until VHCAP
returns above V
PORHCAP_r
, or an internal supply under-voltage condition
occurs.
– No response to DSI commands.
– Bus switch open within t
BSOPEN
.
– Device must be re-initialized when V
HCAP
returns above V
PORHCAP_r
Capacitor Test
Failure
N/A
– Device is Reset and will continue to be reset every t
POR_CAPTEST
until the
capacitor failure is removed.
– No response to DSI commands.
– Bus switch open within t
BSOPEN
.
– Device must be re-initialized when capacitor failure is removed.
DSI Frame
Timeout
N/A V
BUSIN
< V
THF
for longer than t
TO
– Device is Reset and will continue to be reset every t
TO
until the BUSIN
voltage returns above V
THF
or a supply under-voltage condition occurs.
– No response to DSI commands.
– Bus switch open within t
BSOPEN
.
– Device must be re-initialized when V
BUSIN
returns above V
THF
Fuse CRC
Fault
(Factory Array)
Disabled
CRC failure detected in factory
programmed OTP array and the
LOCK_F bit is set. ST Disabled
100
– DSI Read Acceleration Data Short response = zero.
– DSI Read Acceleration Data Long response = normal.
Enabled
CRC failure detected in factory
programmed OTP array and the
LOCK_F bit is set. ST Enabled
110
– DSI Read Acceleration Data Short response = zero.
– DSI Read Acceleration Data Long response = self-test data.
Fuse Error
Detection Fault
(User Array)
Disabled
Mismatch detected in User pro-
grammed OTP array and the
LOCK_U bit is set. ST Disabled
100
– DSI Read Acceleration Data Short response = zero.
– DSI Read Acceleration Data Long response = normal.
Enabled
Mismatch detected in User pro-
grammed OTP array and the
LOCK_U bit is set. ST Enabled
110
– DSI Read Acceleration Data Short response = zero.
– DSI Read Acceleration Data Long response = self-test data.
Self-Test
Enabled
Enabled ST Enabled 1 1 0
– Internal self-test circuitry enabled.
– DSI Read Acceleration Data Short response = self-test data.
– DSI Read Acceleration Data Long response = self-test data.
Self-Test
Lockout
Disabled
Two consecutive Disable Self-
Test DSI commands received.
000
– Internal self-test circuitry disabled.
– Enable Self-Test DSI command does not enable Self-Test. Normal
response to Enable Self-Test DSI command except the ST bit is not set.
– DSI Clear command or Reset disables lockout.
