FAN5646S700X [ONSEMI]

LED 驱动器,可编程指示灯 LED 闪烁器,带单线接口;
FAN5646S700X
型号: FAN5646S700X
厂家: ONSEMI    ONSEMI
描述:

LED 驱动器,可编程指示灯 LED 闪烁器,带单线接口

驱动 光电二极管 商用集成电路 驱动器
文件: 总16页 (文件大小:1177K)
中文:  中文翻译
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May 2013  
FAN5646  
Programmable Indicator ―Soft‖ LED Blinker with TinyWire™  
Single-Wire Interface  
Features  
Description  
The FAN5646 is a flexible and compact solution for a blinking  
or “breathing” LED indicator. The internal programmable blink  
algorithm eliminates any need for continual system processor  
control. This means longer battery life for a hand-held system  
because the system processor is not awakened from sleep  
mode to blink an LED.  
.
.
.
LED “SoftBlink: with Logarithmic Fade Up and Fade  
Down for Power Savings  
Follow or Repeat Pattern Mode for Blinking when  
Applications Processor is Powered Down  
Default Pattern Optionally Modified using TinyWire™  
Single-Wire Digital Control for:  
Very low dropout of 80 mV allows driving an LED without any  
inductors or switch capacitors. LED blink rate, rise and fall  
time, and CTRL line behavior can be programmed by a  
TinyWiresingle-wire digital interface. The on-time and time  
between pulses can be set for up to two different pulse widths.  
LED Current Rise / Fall Time  
tON and tOFF for Up to Two Pulses  
.
High-Side Constant Current LED Driver:  
20 mA Maximum Output Current  
80 mV Drop-out at 20 mA IOUT  
The default for FAN5646 option 01 is “follow” mode, where the  
LED turns on with the programmed rise time, then stays on as  
long as CTRL remains HIGH. When CTRL falls, the LED turns  
off at the programmed fall time. For option 00; when CTRL is  
HIGH continuously, the LED repeats the programmed pattern.  
External RSET (SC70 only) or Internal Current  
Programming  
.
.
.
.
35 A Operating Quiescent Current  
The FAN5646 is available in a four-pin wafer-level chip-scale  
package with 0.4 mm pitch or a five-lead SC70 package.  
Short-Circuit, Under-Voltage, and Thermal Protections  
Wide Input Range: 2.7 to 5.5 V  
VIN  
LED+  
4-Bump WLCSP, 0.4 mm pitch or  
5-Lead SC70 (EIAJ SC88)  
2.7 to 5.5V  
0.1  
1
2
3
5
GND  
ISET  
Applications  
CTRL  
4
.
.
.
Cell Phone  
Pocket PCs and Digital Cameras  
Bluetooth® Headsets PMP and MP3 players  
R=24.3kW  
Figure 1. Typical Application  
Ordering Information  
Part Number  
FAN5646UC00X  
FAN5646S700X*  
FAN5646UC01X*  
FAN5646S701X*  
Option Follow Bit Default Temperature Range  
Package  
Packing  
00  
00  
01  
01  
0
0
1
1
-40 to 85°C  
-40 to 85°C  
-40 to 85°C  
-40 to 85°C  
WLCSP-4, 0.4mm Pitch Tape and Reel  
5-Lead SC70, EIAJ SC88 Tape and Reel  
WLCSP-4, 0.4mm Pitch Tape and Reel  
5-Lead SC70, EIAJ SC88 Tape and Reel  
* This device is End of Life. Please contact sales for additional information and assistance with replacement devices.  
Bluetooth® is a registered trademark of Bluetooth SIG, Inc.  
Important: Contact a Fairchild Semiconductor sales representative for additional performance information and specifications.  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
Pin Configuration  
VIN  
LED+  
CTRL  
LED+  
CTRL  
VIN  
A1  
B1  
A2  
B2  
A2  
B2  
A1  
B1  
GND  
GND  
Figure 2. WLCSP Top View: Bumps Facing Down  
Figure 3. WLCSP Bottom View: Bumps Facing Up  
1
2
3
5
4
VIN  
GND  
ISET  
LED+  
CTRL  
Figure 4. SC70-5 Top View  
Pin Definitions  
Pin #  
Name Description  
WLCSP  
A1  
SC70-5  
1
5
2
4
VIN  
LED+ LED Anode. LED current source output.  
GND  
Ground.  
Input Voltage. Connect to 2.7-5.5 VDC input power source.  
A2  
B1  
B2  
CTRL Control pin. Logic input that controls programming and starts IC playback.  
LED Current Setting. Full-scale LED current is set by tying this pin through a  
ISET  
3
resistor (RSET) to GND. If this pin is left open, an internal current reference is used.  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
2
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  
Parameter  
Min. Max. Units  
VIN, LED+, CTRL Voltage  
ISET Voltage  
-0.3  
6.0  
V
VCC  
VIN  
+
-0.3  
V
0.3  
Human Body Model per JESD22-A114  
Charged Device Model per JESD22-C101  
8.0  
2.0  
ESD  
Electrostatic Discharge Protection Level  
kV  
TJ  
TSTG  
TL  
Junction Temperature  
40  
65  
+150  
+150  
+260  
°C  
°C  
°C  
Storage Temperature  
Lead Soldering Temperature, 10 Seconds  
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  
VIN  
Parameter  
Min. Max. Units  
Power Supply Voltage Range  
2.7  
-40  
-40  
5
5.5  
+85  
+125  
20  
V
TA  
Operating Ambient Temperature Range  
Operating Junction Temperature Range  
Full-Scale LED Current  
°C  
°C  
mA  
TJ  
ILED(FS)  
If ISET is OPEN  
CONTROL[7:6] = 00  
ILED = 7.2 mA to 2.5 mA  
17.4  
20.5  
21.5  
24.3  
48.7  
34.8  
30.1  
28.7  
CONTROL[7:6] = 01  
ILED = 12.1 mA to 7.1 mA  
RSET  
RSET Values for +10% ISET Accuracy(1)  
kΩ  
CONTROL[7:6] = 10  
ILED = 17.3 mA to 12.3 mA  
CONTROL[7:6] = 11  
ILED = 20.4 mA to 17.3 mA  
Note:  
1. Applicable for SC70 version only.  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
3
Electrical Specifications  
VIN = 2.7 V to 5.5 V, TA = -40°C to +85°C, Vf = 1.8 V to [ 3.5 V or VIN 0.1 V ], whichever is smaller. Typical values are at  
TA = 25°C, VIN = 3.6 V, and Vf = 2.5 V.  
Symbol  
Parameter  
Conditions  
Min.  
Typ.  
Max.  
Units  
Power Supplies  
ISD  
IIN  
IACTIVE  
VIH  
IDLE Mode Supply Current  
Quiescent Current  
VIN = 3.6 V, CTRL = 0 V  
VIN = 3.6 V, ILED = 0 mA  
VIN = 3.6 V, LED+ = ON  
0.30  
35  
0.75  
80  
µA  
µA  
µA  
V
Active Mode Supply Current(2)  
Logic Input Voltage HIGH  
Logic Input Voltage LOW  
Control Pin Input Current  
220  
1.1  
VIL  
0.4  
V
IIH  
CTRL = 1.8 V  
VIN Rising  
1
250  
nA  
V
2.5  
2.2  
Under-Voltage Lockout  
Threshold  
VUVLO  
VIN Falling  
V
Regulation  
CONTROL[7:6] = 00  
CONTROL[7:6] = 01  
CONTROL[7:6] = 10  
CONTROL[7:6] = 11  
CONTROL[7:6] = 00  
CONTROL[7:6] = 01  
CONTROL[7:6] = 10  
CONTROL[7:6] = 11  
12.1 kΩ ≤ RSET ≤ 100 kΩ  
VIN = 3.6 V, ΔVIN = 700 mV,  
4.25  
8.70  
5.00  
10.00  
15.00  
20.00  
5.00  
5.75  
11.30  
16.80  
22.00  
5.30  
ISET OPEN  
13.20  
18.00  
4.70  
LED Output  
Current  
ILED  
mA  
9.40  
10.00  
15.00  
20.00  
1.23  
10.60  
15.90  
21.20  
RSET = 24.3kW  
14.10  
18.80  
VISET  
ISET Drive Voltage  
V
IOUT_RIPPLE  
Maximum LED Ripple Current(2) ILED = 20 mA, trise = tfall = 10 µs,  
tLOW = 280 µs  
0.5  
% p-p  
∆IOUT_LOAD  
∆IOUT_LINE  
VDROPOUT  
IOUT Load Regulation  
IOUT Line Regulation  
Dropout Voltage  
LED Vf = 1.8 to 3.45 V, VIN = 3.6 V  
VIN = 2.7 to 4.8 V, Vf = 2.5 V  
ILED = 20 mA, -10% ILED Drop  
Rising Temperature at Junction  
Hysteresis  
-3  
-3  
+3  
+3  
%
%
80  
150  
20  
mV  
TSD  
Thermal Shutdown  
°C  
Timing  
fOSC  
Internal Oscillator Frequency  
VIN = 3.6 V  
61  
77  
93  
kHz  
%
Oscillator Stability Over  
Temperature(2)  
TOSC  
3  
Note:  
2. These parameters are guaranteed by design and characterization.  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
4
Typical Characteristics  
300  
280  
260  
240  
220  
200  
180  
160  
140  
120  
100  
100  
90  
80  
70  
60  
50  
40  
25°C  
85°C  
-40°C  
VF = 3.3V  
IOUT = 15mA  
30  
20  
10  
0
3.00  
2.50  
3.00  
3.50  
4.00  
4.50  
5.00  
5.50  
3.50  
4.00  
4.50  
5.00  
5.50  
VIN [V]  
V
IN  
[V]  
Figure 6. Active Mode Supply Current (LED+ = ON)  
Figure 5. Efficiency at 25C  
60  
25  
50  
40  
30  
20  
10  
0
20  
85°C  
25°C  
25°C  
15  
-40°C  
-40°C  
10  
85°C  
5
0
0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10  
2.50  
3.00  
3.50  
4.00  
4.50  
5.00  
5.50  
VIN - VOUT [V]  
V
[V]  
IN  
Figure 7. Quiescent Current (ILED = 0 mA)  
Figure 8. Output Current vs. Headroom Voltage  
22  
20  
18  
16  
14  
12  
10  
8
6
4
2
0
0
100  
200  
300  
400  
500  
R
[kW]  
SET  
Figure 9. Output Current vs. RSET at 25C  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
5
Circuit Description  
Operating Modes  
Play and Follow Bits  
At power up, the device is in IDLE (“sleep”) Mode until a rising  
edge of a CTRL signal is detected. When both the PLAY and  
FOLLOW bits are 0, the FAN5646 executes the LED pattern  
shown in Figure 10. If the length of the CTRL pulse is less  
than 1.7 s, only the initial pulse is seen. A CTRL pulse that is  
kept HIGH after the initial 1.7 s pulse causes the FAN5646 to  
go into PLAY mode where PULSE1 and PULSE2 are played  
as programmed in the registers (see Table 9).  
Table 3. PLAY and FOLLOW Bit Definition  
PLAY  
FOLLOW  
Behavior  
0
0
1
1
0
1
0
1
Default Behavior per Table 1*  
LED Follows CTRL**  
LED Enters PLAY Mode  
LED Enters One-Shot Mode  
INITIAL 1.7s  
LED  
One-Shot Mode  
This mode is enabled when the PLAY and FOLLOW bits are  
both 1. One-Shot Mode is similar to PLAY mode except that  
PULSE1 is enabled while PULSE2 is always ignored. In One-  
Shot Mode, PULSE1 is played after CTRL is held HIGH for at  
least 200 s. Once PULSE1 is initiated, CTRL is ignored until  
PULSE1 is completed. If CTRL remains HIGH through the tOFF  
time of PULSE1, PULSE1 continues to replay until CTRL is  
lowered. Therefore, One-Shot Mode enables the LED to blink  
in the programmed pattern as long as CTRL is HIGH.  
CTRL  
Figure 10. Initial Pulse Mode Timing  
Table 1. CTRL Pin Operation, CONTROL[1:0] = 00  
Mode  
LED  
Entry  
IDLE  
PLAY  
OFF  
Play Pattern  
Follows CTRL  
OFF  
CTRL LOW for > 200 s  
CTRL HIGH > 2 s  
tRISE  
tON  
tFALL  
tOFF  
FOLLOW  
Program  
CTRL HIGH < 2 s  
CTRL HIGH < 50 s  
The behavior described in Table 1 can be changed using the  
PLAY and FOLLOW bits (see Table 3).  
Figure 11. LED Average Current Profile  
In PLAY Mode, the default pattern of PULSE1 repeats when  
CTRL is held HIGH while PULSE2 is always ignored (see  
Table 2). The FAN5646 plays the programmed sequence for  
blinking the LED until CTRL is set LOW. The programmed  
LED pattern always starts with PULSE1 and it can have tON  
and tOFF times that are multiples of 106ms (see Equation (4))  
while PULSE2 is disabled when its respective tON and tOFF  
times are set to zero.  
Table 4. Brightness Steps during Fade Up/Down (12.5%)  
IOUT(DC) = 12.5% of Full Scale  
Step #  
% of Full Power  
tON (s)  
0
tOFF (s)  
3,333  
3,320  
3,268  
3,177  
3,034  
2,852  
2,617  
2,318  
0
1
2
3
4
5
6
7
0.00%  
0.05%  
0.24%  
0.60%  
1.10%  
1.80%  
2.70%  
3.80%  
Table 2. PULSE1 Default Pattern PLAY Mode  
13  
65  
tRISE  
tFALL  
tON  
tOFF  
156  
299  
482  
716  
1,016  
516ms  
516ms  
533ms  
1600ms  
The IC creates the rise and fall profiles in Figure 11 by  
stepping through PWM dimming values given in Table 4 and  
Table 5. The SLEW1 and SLEW2 registers control the  
brightness of the LED for PULSE1 and PULSE2, respectively.  
In the example in Table 2, only the SLEW1 register is  
programmed with the brightness level for the LED.  
In FOLLOW Mode, the LED+ pin is ON when CTRL is HIGH  
and, as such, follows the CTRL signal applied to FAN5646.  
* Default setting for FAN5646_00  
** Default setting for FAN5646_01  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
6
 
 
 
 
 
 
Table 5. Brightness Steps During Fade Up/Down (100%)  
IOUT(DC) = 100% of Full Scale  
% of Full  
Table 6. LED Maximum Current, WLCSP or ISET Open  
ISET Bits  
00***  
01  
ILED(MAX) (mA)  
5
Step #  
tON (s)  
tOFF (s)  
10  
15  
20  
Power  
10  
8
169  
221  
3,164  
3,112  
3,060  
2,995  
2,917  
2,839  
2,747  
2,656  
2,552  
2,448  
2,331  
2,201  
2,057  
1,914  
1,771  
1,602  
1,432  
1,263  
1,068  
872  
5.1%  
11  
9
6.6%  
ILED can be programmed with an external RSET resistor to GND  
in conjunction with the ISET bits:  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
273  
8.2%  
339  
10.2%  
12.5%  
14.8%  
17.6%  
20.3%  
23.4%  
26.6%  
30.1%  
34.0%  
38.3%  
42.6%  
46.9%  
52.0%  
57.0%  
62.1%  
68.0%  
73.8%  
80.1%  
86.3%  
93.0%  
100.0%  
K
ILED  
or  
417  
RSET 200  
(1)  
495  
K
RSET  
200  
ILED  
586  
677  
Table 7. LED Programming RSET  
781  
ISET Bits  
00***  
01  
K
885  
123  
246  
369  
492  
1,003  
1,133  
1,276  
1,419  
1,563  
1,732  
1,901  
2,070  
2,266  
2,461  
2,669  
2,878  
3,099  
3,333  
10  
11  
RSET should be between 12.1 kW and 100 kW, which  
corresponds to a range of 20 mA and 2.5 mA respectively  
when the ISET bits are 01 and ILED(max) = 10 mA. To achieve  
the highest accuracy using an external RSET, program the  
ISET bits for the ILED closest to the desired ILED based on the  
ISET values in Table 6. Then calculate the appropriate RSET  
for the desired ISET using Equation (1) with the K value for  
the chosen ISET bit value from Table 7.  
RISE and FALL  
The IC creates the rise and fall profiles in Figure 11 by  
incrementing or decrementing the PWM dimming value at a  
rate determined by the SLEW1 and SLEW2 registers. tRISE or  
tFALL are determined by the following equation:  
664  
456  
234  
(2)  
(3)  
tRISE 31NRISE 3.33ms  
tFALL 31NFALL 3.33ms  
0
Changing the Default Values  
where NRISE and NFALL are decimal values in the SLEW  
registers (Table 9). Therefore, the maximum time for rise or  
fall time to or from full current is:  
The default values for the customer-accessible registers  
produce the fixed tON, tOFF, tRISE, and tFALL illustrated in Table 2.  
These values can be changed using registers (see Table 9)  
accessible through the TinyWiresingle-wire interface.  
tRISE/FALL (max) = 1550ms  
If the value of NRISE or NFALL is 0, the LED goes to (or from) off  
to full brightness with no brightness ramp. Therefore, the  
minimum time for controlled brightness stepping to full current  
(NRISE = 1) is:  
The PLAY and FOLLOW control bits define the FAN5646 IC  
behavior (Table 1) of the CTRL line. In addition, the full-scale  
LED current can be changed (Table 6).  
LED Full-Scale Current  
The full-scale LED current can be set using the ISET bits  
(CONTROL[7:6]) to accommodate a wide variety of LEDs.  
tRISE/FALL (min) = 103 ms  
PULSE1 and PULSE2 have independently programmable  
tRISE and tFALL  
.
When CTRL first goes HIGH, the IC determines if an RSET is  
connected. If the ISET is open or shorted to ground, ILED is set  
by an internal reference according to Table 6:  
*** Default setting for the ISET bits.  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
7
 
 
 
Table 8. tON and tOFF Maximum Values  
SLOW Bit Maximum  
tON and tOFF  
The FAN5646 is capable of two pulses of different lengths with  
independently programmable tON, tRISE, and tFALL. The time  
between each of these pulses is established by tOFF  
Units  
ms  
tON  
tOFF  
tON  
0
0
1
1
1600  
4800  
3200  
9600  
.
ms  
(4)  
(5)  
tON (SLOW 1)N _ON 106.6ms  
tOFF (SLOW 1)N _OFF 320ms  
ms  
tOFF  
ms  
where SLOW is the value of the SLOW bit (CONTROL[2] –  
register), which is 1 or 0. N_ON and N_OFF values are  
PULSE1 and PULSE2 register values (Table 9).  
If tON is 0, the LED current ramps down immediately after  
attaining its FINAL value. The minimum tON and tOFF for  
PULSE1 is 6.7 ms, while PULSE2 is disabled when either tON  
or tOFF is 0.  
If N_ONPULSE2 and N_OFFPULSE2 are both 0, only the tON_PULSE1  
and tOFF_PULSE1 are considered.  
Table 9. Register Definition  
Address Default  
Register  
7
6
5
4
3
2
1
0
(Hex)  
(Hex)  
NRISE1: Duration of each brightness  
level during LED turn-on  
NFALL1: Duration of each brightness level  
during LED turn-off  
0
55  
SLEW1  
N_ON1: Duration the LED stays on at  
100% brightness  
N_OFF1: Duration the LED stays off after  
ramping down  
1
2
3
55  
55  
00  
PULSE1  
SLEW2  
NRISE2: Duration of each brightness  
level during LED turn-on  
NFALL2: Duration of each brightness level  
during LED turn-off  
N_ON2: Duration the LED stays on at  
100% brightness  
N_OFF2: Duration the LED stays off after  
ramping down  
PULSE2  
CONTROL  
00(3)  
01(4)  
SLOW  
PLAY FOLLOW  
4
ISET  
RESERVED  
Notes:  
3. Default value for FAN5646_00.  
4. Default value for FAN5646_01.  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
8
 
Programming Examples  
The example in Table 10 and Figure 12 illustrates the  
relationship between the default register contents and the  
pattern of the IC in PLAY mode. BOLD signifies the decimal  
values of the controlling registers.  
The example in Table 11 and Figure 13 illustrates a long-  
duration pulse followed by a short-duration pulse with two  
seconds between each pulse; with rise and fall times of each  
using default values.  
Table 10. PULSE1 Default Example (see Table 2 and  
Table 11. Long-Short Pattern Example (see Figure 13)  
Table 9)  
tFALL1 = tRISE1 = 31 5 3.33 ms = 516 ms  
tON1 = 10 106.6 ms =1066 ms  
tOFF1 = 9 320 ms =2880 ms  
tFALL1 = tRISE1 = 31 5 3.33 ms = 516 ms  
tON1 = 5 106.6 ms =533 ms  
tOFF1 = 5 320 ms =1600 ms  
tFALL2 = tRISE2 = 31 1 3.33 ms = 103 ms  
tON2 = 2 106.6 ms =213 ms  
SLEW1 PULSE1 SLEW2 PULSE2 CONTROL  
Register  
tOFF2= 5 320 ms =1600 ms  
Value  
(HEX)  
55  
55  
00  
00  
02  
SLEW1 PULSE1 SLEW2 PULSE2 CONTROL  
Register  
516ms  
533ms  
516ms  
1600ms  
Value  
(HEX)  
55  
A9  
11  
25  
02  
PULSE1  
Figure 12. PULSE1 Default LED Current Pattern for  
Register in Table 10  
516ms  
1066ms  
516ms  
2880ms  
103ms  
213ms  
103ms  
1600ms  
PULSE1  
PULSE2  
PULSE1  
Figure 13. LED Current Waveform for Register Settings in Table 11  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
9
 
 
 
 
TinyWireDigital Interface  
TinyWire is a flexible, general-purpose, binary protocol  
designed to minimize the number of pins on the IC while  
providing a complete digital interface that can be driven from  
any microcontroller or applications processor using “bit  
banging” on a general-purpose I/O pin. The interface’s speed  
and flexibility accommodate a wide range of processor clock  
capabilities. The fully static nature of the interface requires that  
the applications processor dedicate only sufficient  
uninterrupted attention to bit banging to complete a single  
packet. Interrupted packets are ignored and may be  
subsequently retransmitted.  
Data is written to the selected register at the rising edge of the  
STOP bit. A new CONTROL word may start within 4 s of the  
falling edge of the STOP bit.  
As indicated in Table 1, if CTRL remains LOW for at least  
tRESET after the falling edge of the STOP bit, the IC reverts to  
its IDLE state.  
If CTRL remains HIGH for at least tRESET, the IC executes its  
programmed commands.  
CONTROL Word  
The CONTROL word contains the address of the register that  
receives the data, followed by the data to be written. The  
CONTROL word is shifted LSB first on the CTRL line, as  
shown in Figure 14. The TinyWire protocol operates over a  
wide range of tBIT times (see Table 13), allowing encoding of  
the brightness control bit-stream using a microcontroller  
software “bit-bang” loop.  
The CONTROL word contains the address of the register to  
receive the data followed by the data to be written. The  
FAN5646 data transfer is an 11-bit word, with the first three  
bits (0 through 2) being the register address, LSB first. The  
next eight bits (3 through 10) are the data to be written to the  
selected register, LSB first. Data is latched into the selected  
register at the rising edge of the STOP bit. A new word may  
be transferred to the IC as little as 4s after the falling edge of  
the STOP bit.  
The CONTROL word begins with the rising edge of CTRL. If  
CTRL is HIGH for a greater percentage of the time than it is  
LOW between rising edges, the bit is a 1. Conversely, if CTRL  
is LOW longer than it is HIGH, the bit is a 0. Observe the  
following timing rules to ensure proper data transmission:  
Table 14 shows the CONTROL word structure as well as an  
example of writing 23H into register 2 (A[2:0] = 010).  
Table 14. Address and Data Word  
Table 12. Data Bit Definition  
BIT  
Value  
0
1
2
3
4
5
6
7
8
9 10  
BIT =  
tLOW  
tHIGH  
A0 A1 A2 D0 D1 D2 D3 D4 D5 D6 D7  
0
1
> 75% tBIT  
< 25% tBIT  
< 25% tBIT  
> 75% tBIT  
Example  
0
1
0
1
1
0
0
0
1
0
0
Table 13. Timing Requirements  
Minimum  
Maximum  
40 s  
tLOW  
tHIGH  
500 ns  
500 ns  
200 s  
40 s  
tRESET  
DATA  
LATCHED  
tHIGH  
tLOW  
LOGIC 0  
LOGIC 1  
IDLE  
tBIT  
tBIT  
tRESE T  
STOP BIT  
BIT 0  
BIT 1  
BIT N  
Figure 14. TinyWireProtocol  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
10  
 
 
Physical Dimensions  
F
0.03 C  
E
A
2X  
B
D
0.40  
A1  
Ø0.20  
Cu Pad  
0.40  
BALL A1  
Ø0.30  
INDEX AREA  
0.03 C  
Solder Mask  
2X  
TOP VIEW  
RECOMMENDED LAND PATTERN  
(NSMD PAD TYPE)  
0.06 C  
0.378±0.018  
0.208±0.021  
0.625  
0.547  
E
0.05 C  
C
SEATING PLANE  
D
SIDE VIEWS  
NOTES:  
A. NO JEDEC REGISTRATION APPLIES.  
B. DIMENSIONS ARE IN MILLIMETERS.  
0.005  
C A B  
Ø0.260±0.020  
4X  
C. DIMENSIONS AND TOLERANCE  
PER ASME Y14.5M, 1994.  
0.40  
B
A
(Y)±0.018  
D. DATUM C IS DEFINED BY THE SPHERICAL  
CROWNS OF THE BALLS.  
0.40  
1 2  
E. PACKAGE NOMINAL HEIGHT IS 586 MICRONS  
±39 MICRONS (547-625 MICRONS).  
(X)±0.018  
F
F. FOR DIMENSIONS D, E, X, AND Y SEE  
PRODUCT DATASHEET.  
BOTTOM VIEW  
G. DRAWING FILNAME: MKT-UC004ACrev2.  
Figure 15. 4-Bump WLCSP, 0.4 mm Pitch  
Product-Specific Dimensions  
Product  
D
E
X
Y
FAN5646UC  
0.820 mm  
0.820 mm  
0.210 mm  
0.210 mm  
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without  
notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most  
recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which  
covers Fairchild products.  
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:  
http://www.fairchildsemi.com/packaging/.  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
11  
Physical Dimensions (Continued)  
Figure 16. 5-Lead SC70 (EIAJ SC88)  
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without  
notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most  
recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which  
covers Fairchild products.  
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:  
http://www.fairchildsemi.com/packaging/.  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
12  
© 2009 Fairchild Semiconductor Corporation  
www.fairchildsemi.com  
FAN5646 • Rev. 1.0.3  
13  
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