MAS1634 MAS | Alldatasheet
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Technical content
1 (8) DA1634.001
28 November, 2008
- Quad Current Sink Output
- Wide Supply Voltage Range
- Low Power Consumption
- Power Down Control
DESCRIPTION
MAS1634 is a quad LED driver IC. It has four constant current sink type outputs for driving up t o four LEDs. It has wide supply voltage range and low power consumption ideally suitable for low power applications. MAS1634 can be set into power down mode by a power down control pin. The LED driver control inputs have pull down resistors and which a re disabled in the power down mode. FEATURES APPLICATIONS
- Quad Current Sink Output, 2.1 mA typ
- Wide Supply Voltage Range from 1.0 V to 3.1 V
- Low Power Consumption
- Power Down Control
- LED Driver for Portable Low Power Application
- IR LED Driver for Optical Hand Position Detection of Radio Controlled Watch
Figure 1. MAS1634 Block Diagram Figure 1 presents MAS1634 block diagram.
3 (8) DA1634.001 Parameter Symbol Conditions Min Max Unit Supply Voltage V DD -0.3 6.0 V Storage Temperature T ST -55 +125 oC Input Voltage V IN -0.3 VDD+0.3 V Latch-up Current Limit I LUT For all pins (see note 1) -100 100 mA Stresses beyond those listed may cause permanent damage to the device. The device may not operate under these conditions, but it will not be destroyed. This is a CMOS device and therefore it should be handled carefully to avoid any damage by static voltages (ESD). Note 1. In latch-up testing the supply voltages are connected normally to the tested device. Then pulsed test current is fed to each input separately and device current consumption is observed. If the device current consumption increases suddenly due to test current pulses and the abnormally high current consumption continues after test current pulses are cut off then the device has gone to latch up. Current pulse is turned on for 10 ms and off for 20 ms. Testing is done up to ± 300 mA.
ELECTRICAL CHARACTERISTICS
(Operating Conditions: VDD = 2.0V, Temperature = 25° C unless otherwise mentioned) Parameter Symbol Conditions Min Typ Max Unit Supply Voltage VDD 1.0 2.0 3.1 V Operating Temperature T A -20 +25 +60 ºC Standby Current I SS XPD = “0” 0.5 µA Quiescent Current I SC XPD = “1”, OUTPUTS OFF (INx=”0”) XPD = “1”, 1 OUTPUT ON XPD = “1”, 2 OUTPUTS ON XPD = “1”, 3 OUTPUTS ON XPD = “1”, 4 OUTPUTS ON 140 270 390 500 0.5 300 500 700 900 µA Current driver I CD XPD = “1” VDD = 0.95V, OUT1-4 = 0.075V VDD = 1.15V, OUT1-4 = 0.025V VDD = 1.15V, OUT1-4 = 0.075V VDD = 1.25V, OUT1-4 = 0.175V VDD = 1.70V, OUT1-4 = 0.625V 1.4 1.4 1.4 1.4 2.1 1.8 2.1 2.1 2.1 4.5 4.0 3.45 mA Leakage current of an output I leak VDD = 1.70 V, VOUT1-4 = VDD VIN1-4 = GND 100 nA Input high voltage V IH 0.8*VDD VDD V Input low voltage V IL GND 0.2*VDD V Start up time t st VDD = 1.15 V 15 50 µs
4 (8) DA1634.001 MAS1634 has two functional blocks. First is the LED driver to drive LEDs in a wrist watch applications. Second is Bias voltage generator for generating bias current for the drivers N Operating Modes MAS1634 has two operating modes. These modes are simply ON and OFF modes. ON mode is selected when XPD is high. In ON mode each of the four output drivers can be switched on separately by setting each of the INx control inputs high. If control input is low the corresponding current output driver is off. If all control inputs are low the bias generator is turned off. OFF mode is selected when XPD is low. In OFF mode the bias generator and the current drivers are in power down. The device has two supply voltage pins VDD1 and VDD2 and which are internally connected. It is sufficient to connect only one of the two supply pi ns but if both supplies are connected then they should be connected to same voltage potential. The device has also two supply ground pins GND1 and GND2 and which are internally connected. It is sufficient to connect only one of the two ground pi ns but if both grounds are connected then they should be connected to same ground potential. NN NN Inverting input buffer The inverting buffers buffer the input signals. The se blocks also contain pull-down resistors and they ar e switched in an inactive high impedance state if the XPD input is low. If the XPD pin is high then the INx inputs have pul l down by the pull down resistors. Nominally the values of the pull down resistors are 1.7 M Ω but they can vary ±15%. The XPD input doesn’t have pull down resistor so this input must be driven by the controller or be connected to VDD (always ON mode) in order to achieve properly controlled operation. NN NN Output Driver Four switchable low-voltage 2.1 mA constant current sinks with very low drop-out voltage are implemented to drive external VDD connected LEDs. NN NN Bias Generator Bias voltage generator supplies bias current for th e output drivers. It is turned on if XPD is high and if any of the four control inputs is high.
5 (8) DA1634.001 1580 µ m (X-scribe line width 100 µ m) 1660 µ m (Y-scribe line width 210 µ m) MAS1634 DIE size = 1.58 mm x 1.66 mm; PAD size = 90 µ m x 90 µ m Note: Because the substrate of the die is internally connected to VSS, the die has to be connected to VSS or left floating. Please make sure that GND1 and GND2 are t he first pads to be bonded. Pick-and-place and all component assembly are recommended to be performed in ESD protected area. MAS1634 PAD COORDINATES Note: Coordinates are pad center points where origin has been located in bottom-left corner of the silicon die. Pad Identification Name X-coordinate Y-coordinate N ote Positive Power Supply VDD1 158 µ m 1435 µ m 1 Power Down Input XPD 158 µ m 1225 µ m 3 LED Current Driver Input 1 IN1 158 µ m 1014 µ m 4 LED Current Driver Input 2 IN2 158 µ m 814 µ m 4 LED Current Driver Input 3 IN3 158 µ m 603 µ m 4 LED Current Driver Input 4 IN4 158 µ m 392 µ m 4 Positive Power Supply VDD2 158 µ m 182 µ m 1 Power Supply Ground GND1 1422 µ m 1435 µ m 2 Unused Dummy Pad DUMMY 1422 µ m 1225 µ m 5 LED Current Driver Output 1 OUT1 1422 µ m 1014 µ m LED Current Driver Output 2 OUT2 1422 µ m 814 µ m LED Current Driver Output 3 OUT3 1422 µ m 603 µ m LED Current Driver Output 4 OUT4 1422 µ m 392 µ m Power Supply Ground GND2 1422 µ m 182 µ m 2 Notes: 1) Keep VDD1 and VDD2 in same potential since both are internally connected together. Due to internal connection it is only necessary to connect at least one of the two VDD pins to supply voltage. 2) Keep GND1 and GND2 in same potential since both are internally connected together. Due to internal connection it is only necessary to connect at least one of the two GND pins to supply ground. 3) Power down mode when XPD is low and operating mo de when XPD is high. 4) Each led driver input has 1.7M Ω ± 15% pull-down resistor but which are in an inact ive high impedance state if the XPD input is low (i.e. power down mode). Thi s is the reason why XPD pin requires external contr ol to achieve properly controlled operation. 5) Dummy pad is electrically unconnected and its on ly purpose is to make pad layout symmetrical.
Figure 2. Application circuit of MAS1634 quad LED driver
7 (8) DA1634.001 MAS1634 SAMPLES IN DIL-20 PACKAGE VDD1 3 XPD 4 IN1 5 IN2 6 IN3 7 IN4 8 VDD2 9
19 GND1
17 OUT1
16 OUT2
15 OUT3
14 OUT4
13 GND2
Top Marking Definitions: YYWW = Year Week XXXXX.X = Lot Number xx = Sample Version MAS1634xx YYWW XXXXX.X PIN DESCRIPTION Pin Name Pin Type Function Note 1 NC 2 NC VDD1 3 P Positive Power Supply 1 XPD 4 DI Power Down Input 3 IN1 5 DI LED Current Driver Input 1 4 IN2 6 DI LED Current Driver Input 2 4 IN3 7 DI LED Current Driver Input 3 4 IN4 8 DI LED Current Driver Input 4 4 VDD2 9 P Positive Power Supply 1 10 NC 11 NC 12 NC GND2 13 G Power Supply Ground 2 OUT4 14 AO LED Current Driver Output 4 OUT3 15 AO LED Current Driver Output 3 OUT2 16 AO LED Current Driver Output 2 OUT1 17 AO LED Current Driver Output 1 18 NC GND1 19 G Power Supply Ground 2 20 NC A = Analog, D = Digital, P = Power, G = Ground, I = Input, O = Output, NC = Not Connected Notes: 1) Keep VDD1 and VDD2 in same potential since both are internally connected together. Due to internal connection it is only necessary to connect at least one of the two VDD pins to supply voltage. 2) Keep GND1 and GND2 in same potential since both are internally connected together. Due to internal connection it is only necessary to connect at least one of the two GND pins to supply ground. 3) Power down mode when XPD is low and operating mo de when XPD is high. 4) Each led driver input has 1.7M Ω ± 15% pull-down resistor but which are in an inact ive high impedance state if the XPD input is low (i.e. power down mode ). This is the reason why XPD pin requires external control to achieve properly controlled operation.
8 (8) DA1634.001
ORDERING INFORMATION
Product Code Product Description MAS1634AA1WA611 Quad LED Driver IC EWS-tested 300 µm thick MAS1634 wafer LOCAL DISTRIBUTOR MICRO ANALOG SYSTEMS OY CONTACTS Micro Analog Systems Oy Kamreerintie 2, P.O. Box 51 FIN-02771 Espoo, FINLAND Tel. +358 9 80 521 Fax +358 9 805 3213 http://www.mas-oy.com NOTICE Micro Analog Systems Oy reserves the right to make changes to the products contained in this data shee t in order to improve the design or performance and to supply the best possible product s. Micro Analog Systems Oy assumes no responsibilit y for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights unless otherwise specifi ed in this data sheet, and makes no claim that the circuits are free from patent infrin gement. Applications for any devices shown in this data sheet are for illustration only and Micro Analog Systems Oy makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification.