SI9979_04 Datasheet, PDF (4/9 Pages) Vishay Siliconix – 3-Phase Brushless DC Motor Controller

Si9979
Vishay Siliconix
PIN CONFIGURATION AND ORDERING INFORMATION
SQFP-48
IN_A 1
IN_{B 2}
IN_{C 3}
60/120 ₄
EN ₅
F/R ₆
QS ₇
PWM ₈
BRK ₉
TACH ₁₀
FAULT ₁₁
GND ₁₂
48 47 46 45 44 43 42 41 40 39 38 37
ORDERING INFORMATION
Standard Lead (Pb)-Free Temperature
36 ^CAPA ^{Part Number Part Number}
Range Package
35 SA
Si9979CS
Si9979CS—E3
0 to 70_C
34 ^GTA _Si9979DS
Si9979DS—E3
−40 to 85_C
33 GBA _{NOTE: Si9979CS and Si9979DS are supplied in trays.}
32 CAPB
SQFP-48
31 S_B
30 ^GTB
29 GB_B
28 ^CAPC
27 SC
26 GT_C
25 GBC
13 14 15 16 17 18 19 20 21 22 23 24
Top View
PIN DESCRIPTION
Pins 1−3: IN_A, IN_B, IN_C
IN_A, IN_B, and IN_C are the commutation sensor inputs, and are
intended to be driven by open collector Hall effect switches.
These inputs have internal pull up resistors tied to V_DD, which
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_DD, sets the default condition to 60_
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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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.
Document Number: 70012
S-41209—Rev. E, 21-Jun-04