33970 Datasheet, PDF (20/36 Pages) Freescale Semiconductor, Inc – Dual Gauge Driver Integrated Circuit with Improved Damping Algorithms

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
table under POWER OUTPUT AND CLOCK TIMINGS,
page 7.
• 0 = Clock within spec
• 1 = Clock out of spec
OVUV (OD6) — Undervoltage or Overvoltage Indication. A
logic [1] on this bit indicates the V_PWR voltage fell to a level
below the V_PWRUV since the last SPI communication (refer to
the Static Electrical Characteristics table under POWER
INPUT, page 5). An undervoltage event is just flagged, while
an overvoltage event automatically disables the drive
outputs. Because the pointer may not be in the expected
position, the master may want to re-calibrate the pointer with
an RTZ command after the voltage returns to normal level.
For an overvoltage event, both gauges must be re-enabled
as soon as this flag returns to logic [0]. The state machine will
continue 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
MOV1 (OD5) — This bit identifies Gauge 1 Movement
since last SPI communication. A logic [1] on this bit indicates
the Gauge 1 pointer position changed since the last SPI
command. This information 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
MOV0 (OD4) — 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.
This information allows the master to confirm 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
RTZ1 (OD3) — RTZ1 Is Enabled 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
will continue 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 successfully
RTZ0 (OD2) — RTZ0 Is Enabled 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 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 successfully
OT1 (OD1) — Gauge 1 Junction Overtemperature. A
logic [1] on this bit indicates that the coil drive circuitry
dedicated to drive Gauge 1 has exceeded the maximum
allowable junction temperature since the last SPI
communication and that Gauge 1 has been disabled. It is
recommended that the pointer be re-calibrated using the RTZ
command after re-enabling the gauge using the PECCR
command. 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
OT0 (OD0) — Gauge 0 Junction Overtemperature. A
logic [1] on this bit indicates that the coil drive circuitry
dedicated to drive Gauge 0 has exceeded the maximum
allowable junction temperature since the last SPI
communication and that Gauge 0 has been disabled. It is
recommended that the pointer be re-calibrated using the RTZ
command after re-enabling the gauge using the PECCR
command. This bit remains logic [1] until the gauge is re-
enabled.
• 0 = Temperature within range
• 1 = Gauge 0 maximum allowable junction temperature
condition is reached
RTZ Accumulator Status Information
Most recent valid PECCR command resulting in the RTZ
Accumulator status output:
D11
D10
D9
D8
1
0
x
x
x = Don’t care.
Table 16. RTZ Accumulator Status Output Register
Bits OD15 OD14 OD13 OD12 OD11 OD10 OD9 OD8 OD7 OD6 OD5 OD4 OD3 OD2 OD1 OD0
Read RTZ ACC14 ACC13 ACC12 ACC11 ACC10 ACC9 ACC8 ACC7 ACC6 ACC5 ACC4 ACC3 AC2C ACC1 ACC0
Write –
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
The bits in Table 16 are read-only bits.
RTZ (OD15) — RTZ Bit Is Enabled or Disabled. A logic [1]
on this bit indicates that the Gauge is in the process of
returning to the zero position as requested with the RTZ
command. This bit will continue 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
33970
20
Analog Integrated Circuit Device Data
Freescale Semiconductor