83885 SENSONOR TECHNOLOGIES AS, 83885 Datasheet - Page 10

• Manufacturer Part Number: 83885
• Description: IC, SENSOR, GYRO, SAR100, 28LCC
• Manufacturer: SENSONOR TECHNOLOGIES AS

Specifications of 83885

• No. Of Axes: 1
• Sensor Case Style: LCC
• No. Of Pins: 28
• Supply Voltage Range: 4.45V To 5.5V
• Operating Temperature Range: -40°C To +90°C
• Ic Generic Number: SAR100 - 100
• Interface: SPI
• Interface Type: SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10 STATUS REGISTER AND INTERNAL DIAGNOSTIC MONITORING
Internally in the SAR100, there are 6 error monitoring functions employed to make sure irregular output angular rate is
detected. If any of the monitoring functions detects an irregular condition the corresponding flag becomes „0‟,
otherwise it becomes „1‟. The Status Register flags are available to the application via the RSR SPI command. It is
assumed that a flag can signal an “error” for any length of time. To make sure short error („0‟) pulses are visible to the
application, the „0‟ pulses are "stretched" in time to between 1.5 and 2.0 ms.
After power-up, and until the device start-up is complete, the output from the RARH and RARLX commands is
substituted by the Error Code, see chapter 7.3. After start-up, if any of the flags go to „0‟ (the internal monitoring
functions indicate that the output is irregular), the Error Code is the output from the RARH and RARLX commands,
and also internal digital signal processing is held. This signaling continues indefinitely until the device is powered
down, or, in case of some of the „Recoverable‟ error conditions in the table above, until the PRCEN command is
issued.
The PRCEN command execution must obey the following algorithm:
Note that for the PRCEN command to take effect, the Safe Guard must first be disabled by means of the SGDIS1,-2
and -3 commands. To resume normal operation after recovery, the SafeGuard is re-enabled by using the SGEN
command. Note also that no error conditions will be latched while the SafeGuard is disabled.
TS1440 rev.4
Bit
Position
7
6
5
4
3
2
1
0
1. Wait until no recoverable error conditions are flagged (polling the Status Register)
2. Wait minimum 30 ms (recommended 100 ms)
3. Execute the SGDIS1, -2 and -3 commands
4. Execute the PRCEN command
5. Execute the SGEN command
Flag Name
ADC_OK
SIG_OK
OTPPAR_OK
ATEST_
INACTIVE
PRNG_OK
DET_OK
EXC_OK
(no name)
Monitoring function
ADC_OK is „0‟ if an ADC overflow occurs, otherwise „1‟.
SIG_OK is „0‟ if an arithmetic overflow or underflow occurs in the
digital signal processing, EXCEPT if the signal amplitude exceeds
the output range in the final scaling (by the S0INV parameter),
otherwise „1‟.
OTPPAR_OK is „0‟ if OTP parity check fails, otherwise„1‟.
ATEST_INACTIVE is „0‟ if an analog test mode is active,
otherwise „1‟. This monitoring function will not result in any Error
Code signaling.
PRNG_OK is „0‟ if the AVDD voltage is out of range, otherwise „1‟.
DET_OK is „0‟ if a sensor die detection electrode connection is
open or if a leakage current is present on one or both electrodes,
otherwise „1‟.
EXC_OK is „0‟ if the excitation control loop fails to lock on
resonance frequency such that the excitation amplitude falls
below a critical level, otherwise „1‟.
Not used. Always „1‟.
DATASHEET
10/13
SAR100 Single-Axis Gyro
ButterflyGyro
Recoverable
Yes
No
No
-
No
No
Yes
-
June 2010
™