Document
FAH4820 — Driver for DC Motors (ERMs)
June 2013
FAH4820 Direct Driver for DC Motors (ERMs)
Features
Single-Pin Direct-Drive of ERM for Simple Vibration Control External Motor Enable/Disable, Vibration Control Register-Based I2C Control (Optional; Device Operates in Default Condition) Over-Driving Motor Control, Drive ERM Voltage to VDD Rail Programmable Motor Drive Voltage Low Standby Current: <1 µA Fast Wake-up Time Nearly Rail-to-Rail Output Swing Protections: Under-Voltage, Over-Current, Over-Temperature Package: 10-Lead MLP
Description
The FAH4820 is a high-performance enhanced ERM driver for mobile phone and other hand-held devices. This device does not require a PWM signal to generate vibration of the ERM; it is controlled by the drive level on the HEN input. The ERM spins for the length of time that the HEN pin is held HIGH, then stop when the HEN pin is pulled LOW. The FAH4820’s register maps are accessible via I2C serial communication, which is useful for higher or lower drive voltage across the ERM or if disabling the device is desired.
Related Resources
AN-5067 — PCB Land Pattern Design and SurfaceMount Guidelines for MLP Packages
Applications
Mobile Phones Handheld Devices Keypad Interfaces
Ordering Information
Part Number
FAH4820MPX
Operating Temperature Range
-40°C to +85°C
Package
10-Lead, Dual, JEDEC MO-229, 3 mm Square, Molded Leadless Package (MLP)
Packing Method
3000 Units on Tape & Reel
© 2013 Fairchild Semiconductor Corporation FAH4820 • 1.0.0
www.fairchildsemi.com
FAH4820 — Driver for DC Motors (ERMs)
Block Diagram
VDD
SCL
SDA
Serial I2C Interface
Bandgap Reference
UVLO
OCP
OTP
Programmable LDO
HEN
MDP
Control Logic and Register
Differential Driver
GND MDN
GAIN
Figure 1.
Block Diagram
Pin Configuration
Figure 2.
Pin Assignments
Pin Definitions
Name
VDD GND MDP MDN GAIN NC HEN SDA SCL
Pin #
1 2, 7 3 4 5 6 8 9 10
Type
Power Power Output Output Input NA Input Input Input Power Ground Positive motor driver output Negative motor driver output Gain control for motor driving No connection
Description
Motor enable/disable (HIGH: enable, LOW: disable) I2C data input I2C clock input
© 2013 Fairchild Semiconductor Corporation FAH4820 • 1.0.0
www.fairchildsemi.com 2
FAH4820 — Driver for DC Motors (ERMs)
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
Symbol
VDD VIO DC Supply Voltage
Parameter
Analog and Digital I/O (All Input and Output Pins)
Min.
-0.3 -0.3
Max.
6.0 VCC+0.3
Unit
V V
Reliability Information
Symbol
TJ TSTG JA Junction Temperature Storage Temperature Range Thermal Resistance, JEDEC Standard, Multi-Layer Test Boards, Still Air -65 200
Parameter
Min.
Typ.
Max.
+150 +150
Unit
°C °C °C/W
Electrostatic Discharge Information
Symbol
ESD
Parameter
Human Body Model, JESD22-A114 Charged Device Model, JESD22-C101
Max.
±4 ±1
Unit
kV
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
TA VDD Supply Voltage Range
Parameter
Operating Temperature Range
Min.
-40 2.7
Typ.
3.3
Max.
+85 5.5
Unit
°C V
© 2013 Fairchild Semiconductor Corporation FAH4820 • 1.0.0
www.fairchildsemi.com 3
FAH4820 — Driver for DC Motors (ERMs)
DC Electrical Characteristics
TA = 25°C, VDD = 3.3 V, and VLDO = 3.0 V unless otherwise noted.
Symbol
IIHHEN IILHEN IIHSCL IIHSDA IILSCL IILSDA VIH VIL VOL VOH IOUT tWU tSD RIN CIN IDD1 IDD2 IDD3 IPD VOUT VREG
Parameter
Input Current Input Current Input Current Input Current Input Current Input Current Input Logic HIGH Input Logic LOW Output Voltage Output Voltage Short-Circuit Protection Wake-up Time Shutdown Time Input Resistance Input Capacitance Supply Current Supply Current Supply Current
Conditions
HEN = 3.3 V HEN = 0.0 V SCL = 3.3 V SDA = 3.3 V SCL = 0.0 V SDA = 0.0 V
Min.
Typ.
1 1 0 0 0 0
Max.
2 2 1 1 1 1 0.3 X VDD
Unit
µA µA µA µA µA µA V V mV V
0.7 X VDD VDD = 3.3 V, RL = 10 Ω VDD = 3.3 V, RL = 10 Ω VDD = 3.3 V, MDP to MDN Short to Each Other & Short to GND HEN HIGH to LOW Gain Input – Default Register Setting Gain Input RL = No Load, HEN=LOW RL = No Load, HEN=HIGH RL = 10 Ω, HEN=HIGH VLDO-0.3 500 50 1 10 10 10 2.5 275 20 2.4 -10 3.0 50 3.6 10 20 5.0 150 150 100 200
mA µs µs kΩ pF µA mA mA nA V %
Power-Down Supply VDD = 2.7 V, VLDO = 2.4 V, Current Reg 0x20 Bit 7=0 Output Voltage Range Output Voltage Accuracy
HEN Output
TWU TSD
Figure 3.
Ena.