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參數(shù)資料
| 型號(hào)： | Si9990ACS |
| 廠(chǎng)商： | Vishay Intertechnology,Inc. |
| 英文描述： | 5-V VCM Driver/Spindle Motor Driver For 1.8- and 2.5-Hard Disk Drives(用于1.8V和2.5V的硬盤(pán)驅(qū)動(dòng)的5V語(yǔ)音線(xiàn)圈電機(jī)驅(qū)動(dòng)器/心軸電機(jī)驅(qū)動(dòng)器) |
| 中文描述： | 5V的氯乙烯驅(qū)動(dòng)器/主軸電機(jī)驅(qū)動(dòng)器1.8和2.5硬盤(pán)驅(qū)動(dòng)器（用于1.8伏和2.5伏的硬盤(pán)驅(qū)動(dòng)的5V的語(yǔ)音線(xiàn)圈電機(jī)驅(qū)動(dòng)器/心軸電機(jī)驅(qū)動(dòng)器） |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大小： | 345K |
| 代理商： | SI9990ACS |
Si9990ACS
Vishay Siliconix
FaxBack 408-970-5600, request 70655
www.siliconix.com
S-60752—Rev. C, 05-Apr-99
9
MICROCONTROLLER INTERFACE
Function
Pin Number
Description
DATA
18
Data input for the serial port.
CLK
19
Clock input for serial port data.
CS
20
Strobe input for data word. System commands are executed at the rising edge of CS.
FAULT
17
Undervoltage flag output. Forced low if 5-V supply drops below 3.9 V, or the internal power-on
reset timer (approximately 0.5 ms) is timing out.
DIAGNOSTIC FUNCTIONS
Function
Pin Number
Description
MODE
51
Control input used for manufacture testing only. Grounded or left open during normal operation.
TEST
52
Used as temperature test or step mode clock input. Controlled by serial port.
SPINDLE MOTOR DRIVER
Function
Pin Number
Description
F
COM
27
Spindle commutation clock output. A positive going pulse is generated whenever a valid back
EMF zero crossing is detected. The external speed control, working in either phase or frequency
domain, compares this signal against a reference clock and feedbacks a PWM servo signal to the
spindle driver via the PWM decoder and low-pass filter (A
2
).
Pulse width modulation pull-up command from speed control.
P
U
P
D
49
50
Pulse width modulation pull-down command from speed control.
P
OUT
48
Pulse width modulation output from speed control. This pin is connected to the external
integrating resistor of A
. P
is low, or accelerating, if P
= high and P
= high. P
OUT
is high, or
decelerating, if P
U
= low and P
D
= low. P
OUT
is tri-state, or holding, otherwise.
Inverting input of spindle PWM low-pass filter amplifier.
IA2
25
OA2
26
Output of spindle PWM low-pass filter amplifier. Connect RC network from this pin to IA2 to set
desired cutoff frequency.
IA1
35
Inverting input of spindle loop compensation amplifier.
OA1
34
Output of spindle loop compensation amplifier. Connect RC lead-lag network from this pin to IA1
to set compensation.
R
SPIN
33
Connect an accurate external resistor from this pin to OA1 to set spindle transconductance and
current limit. The recommended resistance is 17 k
.
OUT
A
OUT
B
OUT
C
46, 47
Spindle phase A output terminal.
44, 45
Spindle phase B output terminal.
40, 41
Spindle phase C output terminal.
CST
31
An external capacitor connected to this pin will generate commutation pulses to start up the
spindle motor.
CWD
30
An external capacitor connected to this pin will disable the back EMF comparators during diode
recirculation, detect incorrect motor rotation or stall.
CD1
29
Connect at this pin one of the two external capacitors used to generate the ideal commutation
point from the back EMF zero crossing points.
CD2
28
Connect a second capacitor identical to CD1 at this pin to generate the optimum commutation
delay.
CT
32
Spindle motor center tap input for back EMF sensing.
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