SI9979_04 VISHAY [Vishay Siliconix], SI9979_04 Datasheet - Page 4

• Manufacturer Part Number: SI9979_04
• Description: 3-Phase Brushless DC Motor Controller
• Manufacturer: VISHAY [Vishay Siliconix]

Si9979
Vishay Siliconix
FAULT
PIN DESCRIPTION
Pins 1−3: IN
IN
intended to be driven by open collector Hall effect switches.
These inputs have internal pull up resistors tied to V
eliminates the need for external pull up resistors.
Pin 4: 60/120
The 60/120 input allows the use of the Si9979 with either a 60_
or 120_ commutation sensor spacing. An internal pull up
resistor, which is tied to V
spacing. 120_ spacing is selected by pulling this input to
ground.
Pin 5: EN (Enable)
A logic “1” on this input allows commutation of the motor. This
is the default condition as this pin is pulled up internally. When
this pin is pulled to ground, all gate drive outputs are turned off.
Pin 6: F/R (Forward/Reverse)
A logic “1” on this input selects commutation for motor rotation
in the “forward” direction. This is the default condition as this
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4
60/120
TACH
PIN CONFIGURATION AND ORDERING INFORMATION
PWM
GND
BRK
A
F/R
IN
IN
IN
EN
QS
, IN
A
B
C
B
10
12
11
, and IN
1
2
3
4
5
6
7
8
9
A
, IN
C
48 47
13 14
are the commutation sensor inputs, and are
B
, IN
46 45 44 43 42 41 40 39 38 37
15 16 17 18 19 20 21 22 23 24
C
DD
,
SQFP-48
Top View
sets the default condition to 60_
DD
, which
33
32
31
30
29
28
27
26
25
36
35
34
CAP
S
GT
GB
CAP
S
GT
GB
CAP
S
GT
GB
A
B
C
A
A
B
B
C
C
A
B
C
Part Number
Si9979CS
Si9979DS
NOTE: Si9979CS and Si9979DS are supplied in trays.
pin is pulled up internally. When this pin is pulled to ground, the
commutation sensor logic levels are inverted internally,
causing reverse rotation.
Pin 7: QS (Quadrature Select)
This input determines whether the bottom MOSFETs or both
bottom and top MOSFETs switch in response to the PWM
signal. A logic “1” on this input enables only the bottom
MOSFETs. This is the default condition as this pin is pulled up
internally. When this pin is pulled to ground, both the bottom
and top MOSFETs are enabled.
Pin 8: PWM
An open collector (drain) or TTL compatible signal is applied
to this input to control the motor speed. The QS input
determines which MOSFETs are switched in response to the
PWM signal. If no PWM signal is being used, this input is left
open. It is pulled up internally, which allows the MOSFETs to
follow the commutation sequence.
Standard
ORDERING INFORMATION
Si9979CS—E3
Si9979DS—E3
Lead (Pb)-Free
Part Number
Temperature
−40 to 85_C
0 to 70_C
Range
S-41209—Rev. E, 21-Jun-04
Document Number: 70012
Package
SQFP-48
SQFP-48