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SD10-1R0-R Fiches technique(PDF) 11 Page - Skyworks Solutions Inc. |
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SD10-1R0-R Fiches technique(HTML) 11 Page - Skyworks Solutions Inc. |
11 / 17 page AAT1274 1.5A Single Flash LED Driver IC DATA SHEET 11 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Address EN/SET Rising Edges Function Default (No Programming) 017 Movie Mode Current 100% 1 Not Used 2 Not Used 320 Flash/Movie Mode Cur- rent Ratio 1/7.3 Table 1: AS2Cwire Serial Interface Addressing. AS2Cwire Serial Interface AS2Cwire latches data or address after the EN/SET pin has been held high for longer than tLAT (500μs). Address or data are differentiated by the number of EN/SET rising edges. Since the data registers are 4 bits each, the dif- ferentiating number of pulses is 24 or 16, so that Address 0 is signified by 17 rising edges, and Address 3 by 20 rising edges. Data is inclusively applied to any number of rising edges between 1 and 16. A typical write protocol is a burst of EN/SET rising edges which signify a particular address that is followed by a pause with EN/SET held high for the prescribed tLAT timeout period, then a burst of rising edges signifying data, and a tLAT timeout for the data registers. Once an address is set, then multiple writes to the corresponding data register are allowed. Address 0 is the default address on the first rising edge after the AAT1274 has been disabled. When EN/SET is transitioned from high to low and held low longer than tOFF (500μs), the device enters a shutdown mode and draws less than 1uA from the input supply. All data and address are cleared (reset to 0) during shutdown. AS2Cwire addressing allows for control of the movie mode output current, and the ratio of movie-mode current to flash current. If there are no programmed write instruc- tions applied to the EN/SET pin prior to the assertion of the FLEN pin and the device is enabled, then all registers will be loaded with their default values shown in Table 1. In the event that the number of rising edges applied at the EN/SET pin is less than 17, the internal state machine will interpret instruction to program the output currents to the desired current level for movie-mode operation. Movie Mode Current – Address 0 The AAT1274 movie mode current settings are controlled using the AS2Cwire interface. The default ratio between the flash current level and maximum movie mode cur- rent level is 1:7.3. For example, if an RSET value of 107kΩ is chosen, then the flash current is set to 1500mA. For movie mode operation, the maximum current available is then: I FL(MAX) 7.3 1500mA 7.3 I MOVIE MODE = = = 206mA Address Data 1 EN/SET 2 16 17 Address Data Reg 1 1 2 . . . n ≤ 16 01 0n T HI TLO TLAT T LAT Figure 1: AS2Cwire Serial Interface Timing Diagram. |
Numéro de pièce similaire - SD10-1R0-R |
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