ST1115D SITI [Silicon Touch Technology Inc.], ST1115D Datasheet - Page 7

• Manufacturer Part Number: ST1115D
• Description: PWM Speed Control Double Coil Brushless DC Motor Driver
• Manufacturer: SITI [Silicon Touch Technology Inc.]

where V
Volt, which may slightly vary with the variation of the driving current.
(3) The FGR pin provides the rotation detection output for ST1115C and the tachometer
output for ST1115D. FGR is an open-drain output with a built-in 100k Ω pullup resistor.
An additional resistor can be used to pull up the FGR voltage to the appropriate level,
which depends on the voltage level of the monitoring/control system.
SP-ST1115CD-A.005
DD
denotes the voltage at the VDD pin, see Fig. 1. Normally, V
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SILICON TOUCH TECHNOLOGY INC.
R
R
1
2
=
=
Figure 2. Desired Temperature-Speed Curve
(
V1(V2
V
Fan Speed
DD
−
rpm2
rpm1
V1
-
V
V1
)(
DD
R
V
)R
T1
DD
T2
+
(V1
R2)
+
T1
Temperature
Version
V2(V
-
V2)
DD
T2
：
-
V1)R
A.005
T1
ST1115C/ST1115D
DD
Page
is around 10.8
：
6