33970 datasheet(15/36 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33970

FUNCTIONAL DEVICE OPERATION

LOGIC COMMANDS AND REGISTERS

PE9 (D9)—Pointer Position or Pointer Speed Select bit.

This bit is recognized only if PE11 and PE10 = 1.

• 0 = Gauge 0 or Gauge 1 Pointer Position

• 1 = Gauge 0 and Gauge 1 Pointer Speed

PE8 (D8)—Pointer Position Gauge Select bit. Also the

Position 0 of the selected gauge is determined by the PE7

selection. This bit is recognized only if PE11 and PE10 = 1

and PE9 = 0.

• 0 = Gauge 0 position

• 1 = Gauge 1 position

PE7 (D7)—Position 0 Location Select bit. This bit

determines the Position 0 of the gauge selected by PE8. RTZ

direction will always be to the position 0.

• 0 = Position 0 is the most CCW (counterclockwise)

position

• 1 = Position 0 is the most CW (clockwise) position

PE6 (D6)—This bit must be transmitted as logic [0] for

valid PECCR commands.

PE5 (D5)—Air Core Motor Emulation bit. This bit is

enabled or disabled (acceleration and deceleration is

constant if disabled).

• 0 = Enable

• 1 = Disable

PE4 (D4)—Clock Calibration Frequency Selector

• 0 = Maximum f =1.0 MHz (for 8.0

µs calibration pulse)

• 1 = Nominal f =1.0 MHz (for 8.0

µs calibration pulse)

PE3 (D3)—Clock Calibration Enable bit. This bit enables

or disables the clock calibration.

• 0 = Disable

•1 = Enable

PE2 (D2)—Oscillator Adjustment

•0 = tCLU

• 1 = 0.66 x tCLU

PE1 (D1)—Gauge 1 Enable bit. This bit enables or

disables the output driver of Gauge 1.

• 0 = Disable

•1 = Enable

PE0 (D0)—Gauge 0 Enable bit. This bit enables or

disables the output driver of Gauge 0.

• 0 = Disable

•1 = Enable

Address 001—Maximum Velocity Register (VELR)

The Gauge Maximum Velocity Register is used to set a

maximum velocity for each gauge (refer to Table 8). Bits

V7:V0 contain a position value from 1–225 that is

representative of the velocity position value described in

Table 21, page 24. 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 becomes the

maximum velocity. If the motor is turning at a speed greater

than the new maximum, the motor immediately moves down

the velocity ramp until the speed falls equal to or below it.

Velocity for each motor can be changed simultaneously or

independently by writing V8 and/or V9 to a logic [1]. Bits

V12:V10 must be at logic [0] for valid VELR commands.

The bits in Table 8 are write-only.

V12:V10 (D12:D10)—These bits must be transmitted as

logic [0] for valid VELR commands

V9 (D9) — 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 (D8) — 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 (D7:D0)—Maximum Velocity. Specifies the

maximum velocity position from Table 21. This velocity will

remain the maximum of the intended gauge until changed by

command. Velocities can range from position 1 (00000001)

to position 225 (11111111).

Addresses 010 and 011—Gauge 0/1 Position Registers

(POS0R, POS1R)

Gauge 0 Position Register (SI Addresses 010) bits

P011:P00 are written to when communicating the desired

pointer positions, and Gauge 1 Position Register (SI Address

011) bits P111:P10 are written to 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. Maximum Velocity Register (VELR)

Address 001

Bits

D12

D11

D10

Read

–

Write

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