American Audio B20 Bedienungsanleitung PDF herunterladen (Seite 8)

Si473x-B20

8 Rev. 0.5

Table 5. 2-Wire Control Interface Characteristics

1,2,3

= 2.7 to 5.5 V, V

= 1.5 to 3.6 V, T

= –20 to 85 °C)

Parameter Symbol Test Condition Min Typ Max Unit

SCLK Frequency f

SCL

0—400kHz

SCLK Low Time t

LOW

1.3 — — µs

SCLK High Time t

HIGH

0.6 — — µs

SCLK Input to SDIO

 Setup

(START)

SU:STA

0.6 — — µs

SCLK Input to SDIO

 Hold

(START)

HD:STA

0.6 — — µs

SDIO Input to SCLK

 Setup t

SU:DAT

100 — — ns

SDIO Input to SCLK

 Hold

4,5

HD:DAT

0—900ns

SCLK input to SDIO

 Setup

(STOP)

SU:STO

0.6 — — µs

STOP to START Time t

BUF

1.3 — — µs

SDIO Output Fall Time t

f:OUT

—250ns

SDIO Input, SCLK Rise/Fall Time t

f:IN

r:IN

—300ns

SCLK, SDIO Capacitive Loading C

——50pF

Input Filter Pulse Suppression t

— — 50 ns

Notes:

1. When V

= 0 V, SCLK and SDIO are low impedance.

2. 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.

3. 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.

4. The Si473x delays SDIO by a minimum of 300 ns from the V

threshold of SCLK to comply with the minimum t

HD:DAT

specification.

5. The maximum t

HD:DAT

has only to be met when f

SCL

= 400 kHz. At frequencies below 400 KHz, t

HD:DAT

may be

violated as long as all other timing parameters are met.

20 0.1

1pF

-----------

20 0.1

1pF

-----------

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 23 24

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