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XE3006I019 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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XE3006I019 Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 32 page Data Sheet XE3005/XE3006 10 D0212-116 2.1.10 Start-up and Initialization The CODEC generates its own power on reset signal after a power supply is connected to the VDD pin. The reset signal is made available for the user at the pin NRESET. The rising edge of the NRESET indicates that the startup sequence of the CODEC has finished. In most applications the NRESET pin can be left open. The NRESET signal generated by the CODEC is used to initialize the various blocks in the device and guarantees a correct start-up of the circuit. The start-up sequence that is automatically carried out upon power-up of the device is listed below and illustrated in Figure 10. 1) NRESET is low (0V) when the device is not powered and remains low for a short time when VDD (upper curve in Figure 10) is applied. The low state sustains while VDD, VREG16, VREF are stabilizing. 2) As soon as the MCLK signal is present, a counter is activated that counts 2 21 periods of the MCLK. After this moment the NRESET is in the high state (VDD). VREG16 = 1.6V VREF = 1.2V VDD = 1.8..3.3V 977 ms (MCLK=2.048KHz) main reset NRESET time MCLK . . . Figure 10: Startup sequence and NRESET signal after power-on. The user can use the NRESET pin in 3 different ways and combinations: 1) Leave the NRESET pin not connected. In this case the CODEC will startup as described in figure 10. 2) Use the NRESET pin as an output to indicate, to e.g. a microcontroller, that the CODEC finished its power up sequence and that the CODEC is ready to operate. 3) Use the NRESET pin to force a re-initialisation of the registers to their default values. In this case the user has to force the NRESET to 0V for at least 32 periods of the MCLK. The circuit which forces the NRESET to 0V should be able to sink at least 50 uA. |
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