SA56202 datasheet(13/24 Pages) PHILIPS

13 / 24 page

9397 750 12772

Preliminary data sheet

Rev. 01 — 19 July 2004

13 of 24

Philips Semiconductors

SA56202

One-chip motor driver

7.12 Oscillator

The RC oscillator uses two external components (RREF and COSC) to ﬁx its frequency at

18 MHz. RREF is used to generate a reference current. This reference current is used to

charge and discharge COSC. The nominal oscillation frequency fosc is 18 MHz with

RREF =47kΩ (2 % tolerance) and COSC = 70 pF (5 % tolerance). These values are ﬁxed.

The oscillator can be overruled by applying an 18 MHz clock to pin COSC. The reference

current derived from RREF is also used for RLIM and REMF. RREF should always be

connected.

7.13 Muting functions

Pins CTL1 and CTL2 are used to mute certain parts of the IC. See Table 3. In this table off

means 3-state.

Limiting values

Table 3:

Muting functions

CTL1

CTL2

motor

Sled motor Others

Spindle mode

off

FG and Hall bias on

off

block commutation

off

True-Silent commutation

Table 4:

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol

Parameter

Conditions

Min

Max

Unit

Voltages

VDD(SPN)

spindle driver supply voltage

−0.5

+16

VDD(SLD)

sled driver supply voltage

−0.5

+16

VDD(LD)

loading driver supply voltage

−0.5

+16

VDD(ACT)

actuator drivers supply

voltage

−0.5

+16

VDDA

system supply voltage

−0.5

+6.5

Currents

IDD(SPN)

current on pins 12, 14 and 16

2.1

IDD(SLD)

current on pins 33, 34, 35, 36,

37 and 38

1.2

IDD(ACT)

current on pins 39, 40, 41, 42,

45, 46, 47 and 48

2.0

IHALL

current on pins 1, 2, 3, 4, 5

and 6

−1+1

IHBIAS

current on pin 7

−1

+100

IRPROG

current on pins 8, 9 and 10

−1+1

IOD

current on pins 18 and 28

−1

+10

IDIG

current on pins 26 and 27

−1+1

ICPUMP

current on pins 23, 24 and 25

−20

+20

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