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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP3906 датащи(PDF) 22 Page - Texas Instruments |
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LP3906 датащи(HTML) 22 Page - Texas Instruments |
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22 / 47 page  EN_T Vout Buck1 Vout Buck2 Vout LDO1 Vout LDO2 t2 t3 t4 t1 I 2 C EN_T Ext Enable Pins Regulator ON LP3906 SNVS456M – AUGUST 2006 – REVISED MAY 2013 www.ti.com NOTE LP3906 The default Power on delays can be reprogrammed at final test or by using I2C registers to 1, 1.5, 2, 3, 6, or 11 ms. The regulators can also be programmed through I2C to turn on and off. By default, the I2C enables for the regulators are ON. The regulators are on following the pattern below: Regulators on = (I2C enable) AND (External pin enable OR EN_T high). NOTE The EN_T power-up sequencing may also be employed immediately after VIN is applied to the device. However, VIN must be stable for approximately 8ms minimum before EN_T be asserted high to ensure internal bias, reference, and the Flexible POR timing are stabilized. This initial EN_T delay is necessary only upon first time device power-on for power sequencing function to operate properly. LP3906 Default Power-Up Sequence Table 4. Power-On Timing Specification Symbol Description Min Typ Max Units t1 Programmable Delay from EN_T assertion to VCC_Buck1 On 1.5 ms t2 Programmable Delay from EN_T assertion to VCC_Buck2 On 2 ms t3 Programmable Delay from EN_T assertion to VCC_LDO1 On 3 ms t4 Programmable Delay from EN_T assertion to VCC_LDO2 On 6 ms 22 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LP3906 |
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