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PDF FP5503 Data sheet ( Hoja de datos )

Número de pieza FP5503
Descripción 120mA Current Sinking 10-Bit I2C DAC
Fabricantes Fiti 
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fitipower integrated technology lnc.
FP5503
120 mA Current Sinking 10-Bit I2C® DAC
Description:
The FP5503 is a single 10-bit DAC with 120mA output
current sink capability. It features an internal reference and
operates from a single 2.7 V to 5.5 V supply. The DAC is
controlled via a 2-wire (I2C-compatible) serial interface that
operates at clock rates up to 400 kHz, then the DAC control the
output sink current from 3mA to 120mA.
The FP5503 incorporates a power-on reset circuit, which
ensures that the DAC output powers up to 0 V and remains
there until a valid write takes place. It has a power-down
feature (external pin power down or the I2C input control
software power down) that reduces the current consumption of
the device to 1 μA maximum.
The FP5503 is designed for auto-focus, image
stabilization, and optical zoom applications in camera
phones, digital still cameras, camcorders and other industrial
applications.
The FP5503 has many industrial applications, such as
controlling temperature (heater or cooler control), light, and
movement, over the range 40°C to +85°C without derating.
The I2C address range for the FP5503 is 0x18 to 0x1F
inclusive. Only when the master device initiates the correct
address, FP5503 generates an acknowledge condition and works
normal.
FP5503-1.2-August/2008
Features:
2.7 V to 5.5 V power supply (or unregulated)
120mA current sink
2-wire (I2C®-compatible) serial interface
10-bit resolution DAC
Guaranteed monotonic over all codes
Fully Integrated:
1. Integrated current sense resistor (3.3ohms)
2. Internal reference
3. Power-on reset
4. Ultra-low noise preamplifier
5. Inductive Fly-back Protection diodes
6. Power-down control circuit
Power-down current to 0.5uA typical
small size:1.55mm * 1.55 mm (9-ball WLCSP)
Available packages:
1. 9-ball WLCSP
2. 8-lead TDFN
3. COB
Consumer Applications:
Lens auto-focus
Image stabilization
Optical zoom
Shutters Iris/exposure
Neutral density (ND) filters
Lens covers
Camera phones Digital still cameras
Camera modules
Digital video cameras/camcorders
Camera-enabled devices
Security cameras
Web/PC cameras
Industrial Applications:
Heater control
Fan control
Cooler (Peltier) control
Solenoid control
Valve control
Linear actuator control
Light control
Current loop control
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FP5503 pdf
fitipower integrated technology lnc.
FP5503
Electrical Characteristics Specifications (cont.):
(Unless otherwise specified, VDD=2.7V to 5.5V, AGND=DGND=0V, load resistance RL=25connected to VDD; all specifications
Tmin. to Tmax.).
Parameter
LOGIC INPUTS (SCL, SDA)5
Min.1
Typ.1
Max.1
Unit Test Conditions/Comments
Input Leakage Current, IIN
Input Low Voltage, VINL
- - ±1 uA VIN=0V to VDD
-0.3
- 0.3VDD
V
Input High Voltage, VINH
Input Hysteresis, VHYST
0.7VDD
- VDD+0.3
0.05VDD
-
-
V
V
Digital Input Capacitance, CIN
Glitch Rejection6
- 6 - pF
- - 50 ns Pulse width of spike suppressed.
OUTPUT CHARACTERISTICS
Minimum Sink Current4
Maximum Sink Current
-3
- 120
-
-
mA VDD=3.6V to 4.5V; Device operates over
2.7 to 5.5V but specified maximum sink
mA current might not be achieved.
Output Current During PD
- 80
-
nA PD=1
Output Compliance5
0.6 - VDD
V
Power-up Time
- 20
-
uS To 10% of FS, coming out of power-down
mode; VDD=5V.
1, Temperature range is as follows: -40°C to +85°C.
2, See the terminology section.
3, Linearity is tested using a reduced code range: Codes 32 to 1023.
4, To achieve near zero output current, use the power-down feature.
5, Guaranteed by design and characterization; not product tested. Power Down is active high.
6, Input filtering on both the SCL and SDA inputs suppresses noise spikes that are less than 50ns.
I2C Interface Timing Specification:
(Unless otherwise specified, VDD=2.7V to 5.5V, all specifications Tmin. to Tmax.).
Parameter1 Limit at Tmin. to Tmax. Unit
Description
fSCL 400
t1 2.5
KHz max.
us min.
SCL clock frequency.
SCL cycle time.
t2 0.6
t3 1.3
t4 0.6
t5 100
us min.
us min.
us min.
ns min.
tHIGH, SCL high time.
tLOW, SCL lowh time.
tHD,STA start/repeated start condition hold time.
tSU,STA data setup time.
t62 0.9
us max.
tHD,STA data hold time.
0 us min.
t7 0.6
t8 0.6
t9 1.3
t10 300
0
us min.
us min.
us min.
ns max.
ns min.
tSU,STA setup time for repeated start.
tSU,STO stop condition setup time.
tBUF, bus free time between a stop condition and a start condition.
tR, rise time of both SCL and SDA when receiving.
Maybe CMOS driven.
t11 250
ns max.
tF, fall time of SDA when receiving.
300
20+0.1Cb3
ns max.
ns min.
tF, fall time of both SCL and SDA when transmitting.
Cb 400
pF max.
Capacitive load for each bus line.
1, Guaranteed by design and characterization; not product tested.
FP5503-1.2-August/2008
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FP5503 arduino
fitipower integrated technology lnc.
FP5503
FP5503 and the motor. The power supply of the FP5503 should be decoupled with 0.1μF and 10μF capacitors. These capacitors
should be kept as physically close as possible, with the 0.1μF capacitor serving as a local bypass capacitor, and therefore should be
located as close as possible to the VDD pin. The 10μF capacitor should be a tantalum bead-type; the 0.1μF capacitor should be a
ceramic type with a low effective series resistance and effective series inductance. The 0.1μF capacitor provides a low impedance path
to ground for high transient currents.
The power supply line should have as large a trace as possible to provide a low impedance path and reduce glitch effects on the
supply line. Clocks and other fast switching digital signals should be shielded from other parts of the board by digital ground. Avoid
crossover of digital and analog signals if possible. When traces cross on opposite sides of the board, ensure that they run at right
angles to each other to reduce feed-through effects through the board. The best board layout technique is to use a multilayer board
with ground and power planes, where the component side of the board is dedicated to the ground plane only and the signal traces are
placed on the solder side. However, this is not always possible with a 2-layer board.
The exposed paddle on the FP5503 should be soldered to ground to ensure the best possible thermal performance. The thermal
impedance of the FP5503 TDFN package is 85°C/W when soldered in a 2-layer board. It is defined in the Absolute Maximum Ratings
section.
Application Circuit:
The FP5503 is designed to drive both spring preloaded and non-spring linear motors used in applications such as lens
auto-focus, image stabilization, or optical zoom. The operation principle of the spring-preloaded motor is that the lens position is
controlled by the balancing of a voice coil and spring. Figure 18 shows the transfer curve of a typical spring preloaded linear motor for
auto-focus. The key points of this transfer function are displacement or stroke, which is the actual distance the lens moves in mm, and
the current through the motor in mA.
A start current is associated with spring-preloaded linear motors, which is effectively a threshold current that must be exceeded
for any displacement in the lens to occur. The start current is usually 20mA or greater; the rated stroke or displacement is usually 0.25
mm to 0.4 mm; and the slope of the transfer curve is approximately 10μm/mA or less.
The FP5503 is designed to sink up to 120mA, which is more than adequate for available commercial linear motors or voice
coils. Another factor that makes the FP5503 the ideal solution for these applications is the monotonicity of the device, which ensures
that lens positioning is repeatable for the application of a given digital word. The Fig. 23 shows a typical application circuit for the
FP5503.
Figure 18, Spring Preloaded Voice Coil Stroke vs. Sink Current
FP5503-1.2-August/2008
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