Picture cell driver for STN (LCD driver)

Transcription

1 Picture cell driver for STN (LCD driver) BU976BK / BU976BKV The BU976BK and BU976BKV are man-machine interface ICs designed for applications such as multi-media portable terminals. Specifically, these products are used as driver ICs for operating mode display LCD panels in portable terminals, household appliances, and other similar products. The number of display cells includes 3 segments and 3 commons, enabling drive of up to 96 cells. Applications Multi-media portable terminals, POS terminals, ECR terminals, short wave radios, telephones, cameras, VCRs, movie projectors, car audio systems, and others Features ) Up to 3 segment outputs and 3 common outputs can be displayed, for a total of 96 segments. ) / 3 duty display. 3) Either / or / 3 can be selected for power supply for LCD display. Absolute maximum ratings (Ta = 5 C, = 0V) Parameter Symbol Limits Unit Power supply voltage 0.3 ~ V Power dissipation BU976BK 500 Pd BU976BKV 400 mw Input voltage VIN 0.3 ~ V Operating temperature Storage temperature Reduced by 5mW for each increase in Ta of C over 5 C. Reduced by 4mW for each increase in Ta of C over 5 C. Topr 40 ~ + 85 C Tstg 55 ~ + 5 C Recommended operating conditions (Ta = 5 C, = 0V) Parameter Symbol Min. Typ. Max. Unit Power supply voltage V Input voltage 0 / 3 V 0 / 3 V

2 BU976BK / BU976BKV Block diagram LCD Power CTRL Logic DATA Latch Common Driver Segment Driver COM S 0 Pin assignments S S5 S6 S7 S8 S9 S0 S COM COM N.C N.C. 0 0 S9 S9 BU976BK S8 S7 BU976BKV S8 S7 S6 S6 S5 S5 44 N.C S S5 S6 S7 S8 S9 S0 S N.C.

3 BU976BK / BU976BKV Pin descriptions (BU976BK) Pin No. Pin name I / O Processing when not used Output pin for segment data. Outputs consistent LCD drive voltage to the - 3 S - O OPEN data corresponding to COM to COM O Function Common driver output. The frame frequency is fc = (f / 384) Hz 36 I Reset input. At = L, internal data (including control data) is reset. 4 Oscillator pin (for common and segment alternating waveforms) 4 I Chip select input. At = H, data can be transferred. 43 I Synchronous clock input for serial data transfer 44 I Serial data input OPEN 38 Internal reference voltage for LCD drive. In / bias mode, this is connected to. OPEN 39 Internal reference voltage for LCD drive. In / bias mode, this is connected to. OPEN Electrical characteristics (unless otherwise noted, Ta = 5 C, = 4.5V to 5.5V, = 0V) Parameter Symbol Min. Typ. Max. Unit Conditions Input high level voltage VIH 0.8 V,,, Input low level voltage VIL 0 0. V,,, Input high level current IIH µa,,,, VI = Input low level current IIL µa,,,, VI = Output high level voltage Output low level voltage VSOH VSOL.0.0 V V S ~, IO = 0µA S ~, IO = 0µA VCOH VCOL.0.0 V V COM ~, IO = 00µA COM ~, IO = 00µA VCM / ±.0 V COM ~, / Bias VSM / 3 ±.0 V S ~, / 3Bias Intermediate output voltage VCM / 3 ±.0 V COM ~, / 3Bias VSM / 3 ±.0 V S ~, / 3Bias Power supply current VCM3 / 3 ±.0 V COM ~, / 3Bias IQ µa Low-power mode IDD µa f = 38kHz 3

4 BU976BK / BU976BKV Electrical characteristics AC characteristics (unless otherwise noted, Ta = 5 C, = 4.5V to 5.5V, = 0V) Parameter Symbol Pin Min. Typ. Max. Unit Recommended external resistance R 47 kω Recommended external capacitance C 000 pf Guaranteed oscillation range f khz Data setup time tds, 00 ns Data hold time tdh, 00 ns setup time t, 00 ns hold time tch, 00 ns "H" pulse width th 00 ns "L" pulse width tl 00 ns Rise time tr,, 300 ns Fall time tf,, 300 ns AC timing waveform () When is stopped at L 0.8 t th tl tch tds tdh tr tf () When is stopped at H 0.8 t th tl tch tds tdh tr tf 4

5 BU976BK / BU976BKV Measurement circuit IDD, IQ V P. G. A IIH, LH 0.047µF SW4 SW µF,, S ~ COM ~ A SW SW 3 IO VCM, VCM, VCM3 VSM, VSM V V VSOH, VSOL VCOH, VCOL V GND 000pF, 47kΩ GND P. G.: Control signal generator for programmable signal generator, etc. Measurement conditions Fig. Parameter Input high level voltage Input low level voltage Input high level current Input low level current Output high level voltage Output low level voltage Intermediate output voltage Current dissipation Symbol VIH VIL IIH IIL VSOH SW SW SW3 SW4 VCOH VSOL VCOL VCM VSM 3 3 VCM VSM VCM3 IQ IDD AC characteristics Conditions Set as P.G. input voltage; mode switching test V = V = Pattern, IO = 0µA Pattern, IO = 00µA Pattern, IO = 0µA Pattern, IO = 00µA Pattern 3 Pattern 4 Pattern 4 Pattern 5 Pattern 5 Pattern 6 Test after power on Used as P.G. input condition Measurement pattern Pattern Fig. Pattern Fig.3 Pattern 3 Fig.4 Pattern 4 Fig.5 Pattern 5 Fig.6 Pattern 6 Fig.7 5

6 BU976BK / BU976BKV Circuit operation Timing charts () When is stopped at L D D D3 D BM LC OE Display data Control code Fig.8 When is HIGH, data can be transferred. Data is sent to the shift register at the rising edge of. After all of the data has been transferred, should be set to LOW. The voltage corresponding to the display data transferred at the falling edge of is output. () When is stopped at H D D D3 D BM LC OE Display data Control code Fig.9 Control code table OE 0 Output enable control Normal operation All display data is 0; no display (internal oscillation circuit is operating) BM 0 / 3 bias / bias Bias mode control LC 0 Low power mode control Normal operation Low power mode = The internal oscillation circuit stops oscillating, and segment and common output = 0 6

7 BU976BK / BU976BKV Correspondence between display data input and segments Segment COM S D D D3 D4 D5 D6 D7 D8 D9 D0 D D S5 D3 D4 D5 S6 D6 D7 D8 S7 D9 D0 D S8 D D3 D4 S9 D5 D6 D7 S0 D8 D9 D30 S D3 D3 D33 D34 D35 D36 D37 D38 D39 D40 D4 D4 S5 D43 D44 D45 S6 D46 D47 D48 Segment COM S7 D49 D50 D5 S8 D5 D53 D54 S9 D55 D56 D57 0 D58 D59 D60 D6 D6 D63 D64 D65 D66 3 D67 D68 D69 4 D70 D7 D7 5 D73 D74 D75 6 D76 D77 D78 7 D79 D80 D8 8 D8 D83 D84 9 D85 D86 D87 0 D88 D89 D90 D9 D9 D93 D94 D95 D96 7

8 Timing chart fo = f / 384 BU976BK / BU976BKV fo = f / 384 COM, COM, COM 3, LCD driver output when all LCD segments for COM,, and 3 are out, LCD driver output when only the LCD segment for COM is lit up, LCD driver output when only the LCD segment for is lit up, LCD driver output when the LCD segments for COM and are lit up, LCD driver output when only the LCD segment for is lit up, LCD driver output when the LCD segments for COM and 3 are lit up, LCD driver output when the LCD segments for and 3 are lit up, LCD driver output when all the LCD segments for COM, and 3 are lit up, / bias / 3 duty waveform / 3 bias / 3 duty waveform Fig.0 8

9 BU976BK / BU976BKV Application example 47kΩ 000pF GND COM S Controller BU976BK / BKV S5 96 Segment LCD C 0.047µF S6 / bias mode Fig. 47kΩ 000pF GND COM S Controller C µf BU976BK / BKV S5 96 Segment LCD C 0.047µF S6 / 3 bias mode Fig. 9

10 BU976BK / BU976BKV Application example 47kΩ 000pF GND COM R S 96 Controller R C 0.047µF BU976BK / BKV S5 S6 Segment LCD / bias mode Fig.3 47kΩ 000pF GND COM Controller R R R C 0.047µF BU976BK / BKV S S5 S6 96 Segment LCD / 3 bias mode Fig. 4 The resistance values and capacitance for and should be set to match the LCD panel, and should be checked using test operation. 0

11 BU976BK / BU976BKV Make sure of the following when resetting when the power is on. When using the external reset terminal, make RST = L at ms or more with at.8v or more. When not using the external reset terminal, has to satisfy the following conditions..8v Instruction receipt possible twait ms 0 < ton < 0ms < 0.3V External dimensions (Units: mm) BU976BK BU976BKV 4.0 ± ± ± ± ± ± ± ± ± ± ± ± ± ± 0. QFP44 VQFP48

12 Appendix Notes No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design. The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex (Item 6) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction. Appendix-Rev.0