MC33991DW データシートの表示（PDF） - Freescale Semiconductor

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MC33991DW

Gauge Driver Integrated Circuit

Freescale Semiconductor 

TIMING DESCRIPTIONS AND DIAGRAMS

COMMUNICATION MEMORY MAPS

• 1 = Nominal f=1MHz (for 8us calibration pulse)

PE3—Clock Calibration Enable—This bit enables or

disables the clock calibration.

• 0 = Disable

• 1 = Enable

PE2—Oscillator Adjustment

• 0 = TOSC

• 1 = 0.66 x TOSC

PE1— Gauge 1 Enable—This bit enables or disables the

output driver of Gauge 1.

• 0 = Disable

• 1 = Enable

PE0 —Gauge 0 Enable—This bit enables or disables the

output driver of Gauge 0.

• 0 = Disable

• 1 = Enable

MAXIMUM VELOCITY REGISTER (VELR)

SI Address 001—Gauge Maximum Velocity Register is

used to set a maximum velocity for each gauge. See Table 4.

Bits D7: D0 contain a position value from 1–255

representative of the table position value. The table value

becomes the maximum velocity until it is changed to another

value. If a maximum value is chosen greater than the

maximum velocity in the acceleration table, the maximum

table value will become the maximum velocity. If the motor is

turning at a value greater than the new maximum, the motor

will ignore the new value until the speed falls equal to, or

below it. Velocity for each motor can be changed

simultaneously, or independently, by writing D8 and/or D9 to

a logic [1]. Bits D10: D12 must be at logic [0] for valid VELR

commands.

Table 7. Maximum Velocity Register (VELR)

Address: 001

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Write

0

0

0

V9

V8

V7

V6

V5

V4

V3

V2

V1

V0

These bits are write-only.

V12—V10 These bits must be transmitted as logic 0 for

valid VELR commands

V9—Gauge 1 Velocity—Specifies whether the maximum

velocity determined in the V7: V0 field will apply to Gauge 1.

• 0 = Velocity does not apply to Gauge 1

• 1 = Velocity applies to Gauge 1

V8 — Gauge 0 Velocity—Specifies whether the maximum

velocity specified in the V7: V0 field will apply to Gauge 0.

• 0 = Velocity does not apply to Gauge 0

• 1 = Velocity applies to Gauge 0

V7—V0 Maximum Velocity—Specifies the maximum

velocity position from the acceleration table. This velocity will

remain the maximum of the intended gauge until changed by

command.

Velocities can range from position 1 (00000001) to

position 255 (11111111).

GAUGE 0/1 POSITION REGISTER (POS0R, POS1R)

• SI Addresses 010—Gauge 0 Position Register receives

writing when communicating the desired pointer positions.

• SI Address 011—Gauge 1 Position Register receives

writing when communicating the desired pointer positions.

• Register bits D11: D0 receives writing when

communicating the desired pointer positions.

Commanded positions can range from 0 to 4095. The D12

bit must be at logic [0] for valid POS0R and POS1R

commands.

Table 8. Gauge 0 Position Register (POS0R)

D12

D11

D10

D9

Address: 010

D8

D7

D6

D5

D4

D3

D2

D1

D0

Write

0

P011 P010

P09

P08

P07

P06

P05

P04

P03

P02

P01

P00

These bits are write-only.

P0 12—This bit must be transmitted as logic[0] for valid

commands.

P0 11: P00—Desired pointer position of Gauge 0.

Pointer positions can range from 0 (000000000000) to

position 4095 (111111111111). For a stepper motor requiring

12 microsteps per degree of pointer movement, the

maximum pointer sweep is 341.25°.

Table 9. Gauge 1 Position Register (POS1R)

D12

D11

D10

D9

Write

0

P011 P010

P09

Address: 011

D8

D7

D6

D5

D4

D3

D2

D1

D0

P08

P07

P06

P05

P04

P03

P02

P01

P00

Analog Integrated Circuit Device Data

Freescale Semiconductor

33991

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