PCM1795DBRG4 datasheet(22/68 Pages) TI2

22 / 68 page

Reset

Reset Removal

1024SystemClocks

InternalReset

SystemClock

RST (Pin14)

(RST)

1.4V

Reset

1024SystemClocks

2.4V(Max)

2V(Typ)

1.6V(Min)

InternalReset

SystemClock

ResetRemoval

PCM1795

SLES248A – MAY 2009 – REVISED MARCH 2015

www.ti.com

7.5.1.2 Power-On and External Reset Functions

The PCM1795 includes a power-on reset function, as shown in Figure 40. With VDD > 2 V, the power-on reset

function is enabled. The initialization sequence requires 1024 system clocks from the time VDD > 2 V. After the

initialization period, the PCM1795 is set to its default reset state, as described in Mode Control Registers.

The PCM1795 also includes an external reset capability using the RST input (pin 14). This feature allows an

external controller or master reset circuit to force the PCM1795 to initialize to the default reset state.

Figure 41 and Table 5 show the external reset operation and timing. The RST pin is set to logic 0 for a minimum

of 20 ns. The RST pin is then set to a logic 1 state, thus starting the initialization sequence that requires 1024

system clock periods. The external reset is especially useful in applications where there is a delay between the

PCM1795 power-up and system clock activation.

Figure 40. Power-On Reset Timing

Figure 41. External Reset Timing

Table 5. External Reset Timing Characteristics for Figure 41

MIN

MAX

UNIT

t(RST)

Reset pulse duration, low

7.5.2 Function Descriptions

7.5.2.1 Zero Detect

The PCM1795 has a zero-detect function. When the PCM1795 detects the zero conditions as shown in Table 6,

the PCM1795 sets ZEROL (pin 1) and ZEROR (pin 2) high.

Submit Documentation Feedback

Product Folder Links: PCM1795

PCM1795DBRG4 датащи(PDF) 22 Page - Texas Instruments

PCM1795DBRG4 датащи(HTML) 22 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

датащи скачать

ссылки URL