PC33991DHSLASHR2 datasheet(19/36 Pages) MOTOROLA

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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33991

SO Communication

When the CS pin is pulled low, the internal status word

clocked out MSB (OD15) first. Following a CS transition0to1,

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 TCLC

in the SPI Interface Timing table.

• 0 = Clock with in spec

• 1 =Clock outofspec

ST6–Under voltage or over voltage Indication—A logic [1] on

this bit indicates the VPWR voltage fell to a level below the

VPWRUV, or it exceeded an upper limit of VPWROV, as specified

in the Static Electrical Characteristics table, since the last SPI

communication. An under voltage event is just 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 as soon as

this flag returns to logic [0]. The state machine continues to

operate properly as long as VDD is within the normal range.

• 0 = Normal range

• 1 = Battery voltage fell below VPWRUV, or exceeded

VPWROV

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–Gauge 1—Junction over temperature. A logic [1] on this

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

pointerbere-calibratedusing theRTZ commandafter re-

enabling the gauge using the PECR 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

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

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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