33970 datasheet(20/36 Pages) FREESCALE

20 / 36 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33970

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 VPWR voltage fell to a level

below the VPWRUV 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 VDD is within the

normal range.

• 0 = Normal range

• 1 = Battery voltage fell below VPWRUV or exceeded

VPWROV

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:

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

D11

D10

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

–

33970 Datasheet(PDF) 20 Page - Freescale Semiconductor, Inc

33970 Datasheet(HTML) 20 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Datasheet Download

Link URL