American Audio B20 Bedienungsanleitung PDF herunterladen (Seite 7)

Si473x-B20

Rev. 0.5 7

Figure 1. Reset Timing Parameters for Busmode Select

Table 4. Reset Timing Characteristics

1,2

= 2.7 to 5.5 V, V

= 1.5 to 3.6 V, T

= –20 to 85 °C)

Parameter Symbol Min Typ Max Unit

RST

Pulse Width and GPO1, GPO2/INT Setup to RST



SRST

100 — — µs

GPO1, GPO2/INT

Hold from RST t

HRST

30 — — ns

Important Notes:

1. When selecting 2-wire mode, the user must ensure that a 2-wire start condition (falling edge of SDIO while SCLK is

high) does not occur within 300 ns before the rising edge of RST.

2. When selecting 2-wire mode, the user must ensure that SCLK is high during the rising edge of RST

, and stays high until

after the first start condition.

3. If GPO1 and GPO2 are actively driven by the user, then minimum t

SRST

is only 30 ns. If GPO1 or GPO2 is hi-Z, then

minimum t

SRST

is 100 µs to provide time for on-chip 1 M devices (active while RST is low) to pull GPO1 high and

GPO2 low.

70%

30%

GPO1

70%

30%

GPO2/

INT

70%

30%

SRST

RST

HRST

1 2 3 4 5 6 7 8 9 10 11 12 ... 23 24

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