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SX1512BIULTRT Datasheet(PDF) 37 Page - Semtech Corporation |
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SX1512BIULTRT Datasheet(HTML) 37 Page - Semtech Corporation |
37 / 43 page ADVANCED COMMUNICATIONS & SENSING Rev 3 – 9 th Sept. 2010 37 www.semtech.com SX1510B/SX1511B/SX1512B World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine 6 APPLICATION INFORMATION 6.1 Typical Application Circuit Figure 20 - Typical Application Schematic 6.2 Typical LED Connection Typical LED Connection is described below. The LED is usually connected to a high voltage (VBAT) to take advantage of the high sink current of the I/O and to accommodate high LED threshold voltages (VLED). Please note that in this configuration the IO must be programmed as open drain output (RegOpenDrain) with no pull-up (RegPullUp) and input buffer must be disabled (RegInputBufferDisable). VCCx can take any value without compromising LED operation. VCCx IOx VBAT VCCx VLED * *LED colour/technology dependent SX1510/11/12B IOL R Figure 21 – Typical LED Operation Serial R must be calculated for IOL not to exceed its max spec (Cf. Table 5) else VOL will increase. VDDM NRESET SCK SO GND VCC1 I/O[0] I/O[2] I/O[3] NINT I/O[4] I/O[5] I/O[6] I/O[7] VCC2 SX1511B SCK SO I/O I/O 3.3V 2.5V 1.2V 5V Optional (depends on the application) 5V Host controller OSCIO I/O[1] SI SI NSS NSS |
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