Si4730/31-D50
Table 5. 2-Wire Control Interface Characteristics 1,2,3
(V A = 2.7 to 5.5 V, V D = 1.62 to 3.6 V, T A = –20 to 85 °C)
Parameter
SCLK Frequency
SCLK Low Time
SCLK High Time
SCLK Input to SDIO ? Setup
(START)
SCLK Input to SDIO ? Hold
(START)
SDIO Input to SCLK ? Setup
SDIO Input to SCLK ? Hold 4,5
SCLK input to SDIO ? Setup
(STOP)
STOP to START Time
SDIO Output Fall Time
Symbol
f SCL
t LOW
t HIGH
t SU:STA
t HD:STA
t SU:DAT
t HD:DAT
t SU:STO
t BUF
t f:OUT
Test Condition
Min
0
1.3
0.6
0.6
0.6
100
0
0.6
1.3
Typ
Max
400
900
250
Unit
kHz
μs
μs
μs
μs
ns
ns
μs
μs
ns
C b
20 + 0.1 -----------
1pF
C b
20 + 0.1 -----------
SDIO Input, SCLK Rise/Fall Time
SCLK, SDIO Capacitive Loading
Input Filter Pulse Suppression
t f:IN
t r:IN
C b
t SP
1pF
300
50
50
ns
pF
ns
Notes:
1. When V D = 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 Si4730/31 delays SDIO by a minimum of 300 ns from the V IH 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.
Rev. 1.0
7
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