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BUF01900 Datasheet(PDF) 11 Page - Texas Instruments |
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BUF01900 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 32 page POR(1.1V) t (min) ³ F 500 s m t (min) 10 s R ³ m V SD t OFF 100 s ³ m BUF12840 www.ti.com SBOS519A – OCTOBER 2010 – REVISED JULY 2011 POWER-ON RESET (POR) AUTO READ Immediately after power up, all DAC outputs are set FUNCTION to 0V. During the auto-read function, values are written into the DAC registers as they are being read Figure 14 depicts the BUF12840 POR Master Mode from the EEPROM. Once the auto-read function is auto read function and timing. The BUF12840 makes complete, all values are simultaneously loaded from the first attempt to read the external EEPROM 5ms the DAC registers to the DAC outputs. Therefore, all after the POR (power-on reset) condition is met, as values change together. This action is performed shown in Figure 13. Following the initial 5ms wait regardless of the state of the LD pin and occurs by period, the BUF12840 queries the EEPROM with a default after auto-read is completed. digital word that includes an EEPROM address and acknowledge request. If communication with the Once the information is downloaded from the EEPROM is established, the download finishes in EEPROM, the BUF12840 automatically goes into 10ms. slave mode, where all slave mode operations are supported. The BUF12840 remains in slave mode However, if the first read attempt is not successful, until another POR, GCR (general-call reset), or RA the BUF12840 waits for 1ms and then tries to start (read again) condition is met. the download again. This process repeats itself until a successful acknowledge from the EEPROM is The EN pin should be set to a high level within 15ms detected or until 10 read attempts have been made. If of crossing the POR condition. If the EN pin active at any time during this process the BUF12840 does high state is not detected during the first 10 query detect a successful acknowledge from the EEPROM attempts, the BUF12840 automatically enters slave and the EN pin is properly set, the BUF12840 initiates mode. If the master mode auto read function must be the upload and reads the contents of the EEPROM, terminated at any time during the auto read process, which takes approximately 10ms to complete. The the EN pin can be set to a low '0' level that forces the DAC outputpower-on reset value is 0V. The state of BUF12840 into slave mode and the automatic VS (analog supply voltage) does not affect POR or download process to stop. If an EEPROM the auto read function. acknowledge is not detected during the possible 10 read attempts, the BUF12840 automatically goes into slave mode following the tenth read attempt. Note that the analog power, VS, does not need to be on during any interface communication. Figure 13. POR Copyright © 2010–2011, Texas Instruments Incorporated 11 |
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