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參數(shù)資料
| 型號(hào)： | MC33991 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Gauge Driver Integrated Circuit(標(biāo)尺驅(qū)動(dòng)器集成電路) |
| 中文描述： | 儀表驅(qū)動(dòng)集成電路（標(biāo)尺驅(qū)動(dòng)器集成電路） |
| 文件頁數(shù)： | 19/36頁 |
| 文件大?。?/td> | 660K |
| 代理商： | MC33991 |
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33991
19
SO Communication
When the CS pin is pulled low, the internal status word
register is loaded into the output register and the fault data is
clocked out MSB (OD15) first. Following a CS transition 0 to 1,
the device determines if the message shift was a valid length
and if so, latches the data into the appropriate registers. A valid
message length is greater than 0 bits and a multiple of 16 bits.
At this time, the SO pin is tri-stated and the fault status register
is now able to accept new fault status information. If the
message length is determined to be invalid, the status
information is not cleared. It is transmitted again during the next
SPI message.
Any bits clocked out of the SO pin after the first sixteen, is
representative of the initial message bits clocked into the SI pin.
That is due to the CS pin first being transitioned to a logic [0].
This feature is useful for daisy chaining devices as well as
message verification.
These are
read-only
bits.
ST15–ST8—Bits representing the eight bits from the RTZ
accumulator as determined by the status of bits RZ2 and RZ3
of the RTZR, defined in Table 8. These bits represent the
integrated signal present on the non-driven coil during an RTZ
event. These bits will be logic [0] after power-on reset, or after
the RST pin transitions from logic [0] to [1]. After an RTZ event,
they will represent the last RTZ accumulator result before the
RTZ was stopped.
ST7–Calibrated Clock out of Specification—A logic [1] on
this bit indicates the clock count calibrated to a value outside of
the expected range, and given the tolerance specified by T
CLC
in the
SPI Interface Timing
table
.
0 = Clock with in spec
1 = Clock out of spec
ST6–Under voltage or over voltage Indication—Alogic[1] on
this bit indicates the V
PWR
voltage fell to a level below the
V
PWRUV
, or it exceeded an upper limit of V
PWROV
, as specified
in the
Static Electrical Characteristics
table, since the last SPI
communication. An under voltage event isjust flagged, while an
over voltage event automatically disables the driver outputs.
Because the pointer may not be in the expected position, the
master may want to re-calibrate the pointer position with a RTZ
command after the voltage returns to a normal level. For an
over voltage event, both gauges must be re-enabled assoon as
this flag returns to logic [0]. The state machine continues to
operate properly as long as V
DD
is within the normal range.
0 = Normal range
1 = Battery voltage fell below V
PWRUV
, or exceeded
V
PWROV
ST5–Gauge 1—Movement since last SPI communication. A
logic [1] on this bit indicates the Gauge 1 pointer position has
changed since the last SPI command. This allows the master to
confirm the pointer is moving as commanded.
0 = Gauge 1 position has not changed since the last SPI
command
1 = Gauge 1 pointer position has changed since the last
SPI command
ST4—Gauge 0—Movement since last SPI communication.
A logic [1] on this bit indicates the Gauge 0 pointer position
has changed since the last SPI command. The master confirms
the pointer is moving as commanded.
0 = Gauge 0 position has not changed since the last SPI
command
1 = Gauge 0 pointer position has changed since the last
SPI command
ST3–RTZ1—Enabled successful or disabled. A logic [1] on
this bit indicates Gauge 1 is in the process of returning to the
zero position as requested with the RTZ command. This bit
continues to indicate a logic [1] until the SPI message following
a detection of the zero position, or the RTZ feature is
commanded off using the RTZ message.
0 = Return to zero disabled
1 = Return to zero enabled successful
ST2–RTZ0—Enabled successful or disabled. A logic [1] on
this bit indicates Gauge 0 is in the process of returning to the
zero position as requested with the RTZ command. This bit
continues indicating a logic [1] until the SPI message following
a detection of the zero position, or the RTZ feature is
commanded off, using the RTZ message.
0 = Return to zero disabled
1 = Return to zero enabled successful
ST1–Gauge1—Junctionovertemperature.Alogic[1]onthis
bit indicates coil drive circuitry dedicated to drive Gauge 1 has
exceeded the maximum allowable junction temperature since
the last SPI communication. Additionally, the same indication
signals the circuitry Gauge 1 is disabled. It is recommended the
pointer be re-calibrated using the RTZ command after re-
enabling the gaugeusingthePECRcommand. This bit remains
logic [1] until the gauge is enabled.
0 = Temperature within range
1 = Gauge 1 maximum allowable junction temperature
condition has been reached
Table 12. Status Output Register
OD15
OD14
OD13
OD12
OD11
OD10
OD9
OD8
OD7
OD6
OD5
OD4
OD3
OD2
OD1
OD0
Read
ST15
ST14
ST13
ST12
ST11
ST10
ST9
ST8
ST7
ST6
ST5
ST4
ST3
ST2
ST1
ST0
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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