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PDF FAH4820 Data sheet ( Hoja de datos )
| Número de pieza | FAH4820 | |
| Descripción | Direct Driver | |
| Fabricantes | Fairchild Semiconductor | |
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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
Applications
Mobile Phones
Handheld Devices
Keypad Interfaces
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 Surface-
Mount Guidelines for MLP Packages
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
1 page  
I2C DC Electrical Characteristics
TA = 25°C, VDD = 3.3 V, and VLDO = 3.0 V unless otherwise noted.
Symbol
Parameter
VIL Low-Level Input Voltage
VIH High-Level Input Voltage
VOL
Low-Level Output Voltage at 3 mA Sink Current
(Open-Drain or Open-Collector)
IIH High-Level Input Current of Each I/O Pin, Input Voltage = VDD
IIL Low-Level Input Current of Each I/O Pin, Input Voltage = 0 V
Fast Mode (400 kHz)
Min.
Max.
Unit
-0.3 0.6
V
1.3 V
0 0.4 V
-1 1 µA
-1 1 µA
I2C AC Electrical Characteristics
Symbol
Parameter
Fast Mode (400 kHz)
Min.
Max.
Unit
fSCL SCL Clock Frequency
0 400 kHz
tHD;STA Hold Time (Repeated) START Condition
0.6 µs
tLOW Low Period of SCL Clock
1.3 µs
tHIGH High Period of SCL Clock
0.6 µs
tSU;STA Set-up Time for Repeated START Condition
0.6 µs
tHD;DAT
tSU;DAT
tr
tf
Data Hold Time
Data Set-up Time(1)
Rise Time of SDA and SCL Signals(2)
Fall Time of SDA and SCL Signals(2)
0
100
20+0.1Cb
20+0.1Cb
0.9
300
300
µs
ns
ns
ns
tSU;STO Set-up Time for STOP Condition
0.6 µs
tBUF Bus-Free Time between STOP and START Conditions 1.3 µs
tSP Pulse Width of Spikes that Must Be Suppressed by the Input Filter 0 50 ns
Notes:
1. A Fast-Mode I2C Bus® device can be used in a Standard-Mode I2C bus system, but the requirement tSU;DAT
≥250 ns must then be met. This is automatically the case if the device does not stretch the LOW period of the
SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the
Serial Data (SDA) line tr_max + tSU;DAT = 1000 + 250 = 1250 ns (according to the Standard-Mode I2C Bus
specification) before the SCL line is released.
2. Cb equals the total capacitance of one bus line in pf. If mixed with High-Speed Mode devices, faster fall times are
allowed according to the I2C specification.
Figure 4. Definition of Timing for Full-Speed Mode Devices on the I2C Bus
© 2013 Fairchild Semiconductor Corporation
FAH4820 • 1.0.0
5
www.fairchildsemi.com
5 Page 
Figure 10 is an example of using Arduino Uno to control
the HEN pin based on which of the three switches is
pressed. In the example program below; when SW1 is
pressed (which is connected to Arduino input pin 10),
the ERM spins once for the length of time the program
holds pin 12 HIGH. The other switches produce a
double pulse (SW2) and a triple pulse (SW3) output.
Due to EMI noise, it is recommended that a 100 pF
capacitor be placed across the MDP and MPN pins. In
this case, this is C3, which greatly reduces EMI
produced by the ERM.
VCC_3V3
C2
100n
C3
U3
FAH4820
1
VDD
2
GND
3
MDP
4
MDN
5
GAIN
SCL
SDA
HEN
GND
NC
10
9
8
7
6
0
1
2
3
4
5
6
7
8
9
10
11
12
13
GND
AREF
100pF
ERM
SW1
SW Momentery
SW2
SW Momentery
SW3
SW Momentery
R1
10K
R2
10K
R3
10K
VCC_3V3
Figure 10. Arduino Uno Control HEN Pin
Vibration Alert Arduino Example Program
/* FAH4820 vibration alert Arduino program*/
int VIBpin = 12;
int switchPin = 8;
int switchPin1 = 9;
int switchPin2 = 10;
void setup()
{
pinMode(VIBpin, OUTPUT);
pinMode(switchPin, INPUT);
pinMode(switchPin1, INPUT);
pinMode(switchPin2, INPUT);
}
void loop()
{
if (digitalRead(switchPin) == HIGH) /* run this sequence if pin 8 is high - triple
pulse*/
{
© 2013 Fairchild Semiconductor Corporation
FAH4820 • 1.0.0
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet FAH4820.PDF ] | |
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