Technical Note
5/14
BD67929EFV
www.rohm.com
2010.12 - Rev.
© 2010 ROHM Co., Ltd. All rights reserved.
●Terminal function
○HWP, HVP, HUP, HWN, HVN, HUN/Hall signal input terminal
These terminals are the input terminals of the output signals from Hall elements. This has the comparator with hysteresis.
The width of hysteresis voltage is ±12mV(Typ.). The output of this comparator will be high if the voltage of HxP terminal
is greater than the voltage of HxN terminal by 12mV, and the level will be low if the voltage of HxP terminal is less than
the voltage of HxN terminal by 12mV. For the countermeasures against noise interface with Hall inputs, the connection of
a capacitor with a capacitance of approximately 0.01 - 0.1µF between HxP terminal and HxN terminal.
○PD/Phase comparison output terminal
This terminal outputs the signal that is the comparison of FG signal and CLK signal.
○EI/Error amplifier input terminal
This terminal is the input terminal of the error amplifier.
○EO/Error amplifier output terminal
This terminal is the output terminal of the error amplifier. It is connected to the input terminal of motor torque command
signal inside the IC.
○CLK/Speed control clock input terminal
This terminal is the CLK signal input terminal to control the speed. This terminal has the 100kΩ resistor which is
pulled-up to the internal regulator. This block detect the falling edge. In case that there is the noise on the CLK signal, it
makes the miscount of the CLK signal. Be sure to design the pattern without the influence of the noise.
○SS/Start/Stop signal input terminal
This terminal makes the motor start or stop.
This terminal has the 100kΩ resistor which is pulled-up to the internal regulator.
SS
LO start
HI stop
When SS=HI, IC becomes stop condition. Stop condition is Free Run or Short Brake that decided by SB terminal.
Moreover, it makes the HB terminal off, and shut down the current to the Hall element. It is very useful to low power
consumption.
○LD/Phase locked detection output terminal
When the rotation count of the motor is within 10% of the target rotation count, the LD terminal becomes LO.
This terminal is open drain type output, please connect to the external regulator (0～5.5V recommended) through the
resistor. The capability of this terminal is 15mA maximum, please set the voltage of the external regulator and the value of
resistor to be within 15mA.
○OSC/Connection terminal of capacitor to set PWM oscillating frequency
This terminal is the connection terminal of capacitor to make the triangle waveform that set the PWM frequency.
f
PWM
= 44µ / C [Hz]
ex.) when C=220pF, f=200〔kHz〕
○CNF/Connection terminal of capacitor of Current Sense Amp.
This terminal is the connection terminal of capacitor to compensate the phase of CS Amplifier.
○SB/Short brake signal input terminal
This terminal is the input signal terminal that set output condition when the voltage of SS is HI. This terminal has the
100kΩ resistor which is pulled-up to the internal regulator. When the voltage of SB terminal turns to LO, all low side
MOS FET turns to ON, and it should be short brake condition. It is very useful to reduce the speed quickly.
SB stop mode
LO Short brake mode
HI Free run mode
○BRMODE/PLL brake setting terminal
This IC has the two kinds of deceleration method. The method is configurable by which terminal to connect with
BRMODE, VREG or GND terminal. This terminal has the 100kΩ resistor which is pulled-up to the internal regulator.
BRMODE deceleration method
GND short brake
VREG free run
