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MAX1576 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1576 Datasheet(HTML) 7 Page - Maxim Integrated Products |
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7 / 22 page  MC14489B MOTOROLA 7 a through h (Pins 1, 2, 4 – 7, 19, 20) Anode–Driver Current Sources. These outputs are close- ly–matched current sources which directly tie to the anodes of external discrete LEDs (lamps) or display segment LEDs. Each output is capable of sourcing up to 35 mA. When used with lamps, outputs a, b, c, and d are used to independently control up to 20 lamps. Output h is used to con- trol up to 5 lamps dependently. (See Figure 17.) For lamps, the No Decode mode is selected via the configuration regis- ter, forcing e, f, and g inactive (low). When used with segmented displays, outputs a through g drive segments a through g, respectively. Output h is used to drive the decimals. Refer to Figure 9. If unused, h must be left open. Bank 1 through Bank 5 (Pins 9, 13, 15, 16, 17) Diode–Bank FET Switches. These outputs are low–resis- tance switches to ground (VSS) capable of handling currents of up to 320 mA each. These pins directly tie to the common cathodes of segmented displays or the cathodes of lamps (wired with cathodes common). The display is refreshed at a nominal 1 kHz rate to achieve optimum brightness from the LEDs. A 20% duty cycle is uti- lized. Special design techniques are used on–chip to accommo- date the high currents with low EMI (electromagnetic interfer- ence) and minimal spiking on the power lines. POWER SUPPLY VSS (Pin 14) Most–negative supply potential. This pin is usually ground. Resistor Rx is externally tied to ground (VSS). Therefore, the chip’s VSS pin does not contain the Rx current compo- nent. VDD (Pin 13) Most–positive supply potential. To guarantee data integrity in the registers and to ensure the serial interface is functional, this voltage may range from 3 to 6 volts with respect to VSS. For example, within this volt- age range, the chip could be placed in and out of the low– power mode. To adequately drive the LEDs, this voltage must be 4.5 to 6 volts with respect to VSS. The VDD pin contains the Rx current component plus the chip’s current drain. In the low–power mode, the current mir- ror and clock oscillator are turned off, thus significantly reduc- ing the VDD current, IDD. Figure 7. a through h Nominal Current per Output versus Rx 35 30 25 20 15 10 5 400 800 1.2 k 2.0 k 2.4 k 2.8 k 3.2 k 3.6 k 4.0 k 1.6 k 5 V SUPPLY BIT D23 = HIGH (BRIGHTEN LEDs) WITH D23 = LOW, iOH IS CUT BY ∼50%. Rx, EXTERNAL RESISTOR ( Ω) NOTE: Drive current tolerance is approximately ± 15%. |
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