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SI4721-B20

BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

Silicon Laboratories 

Si4720/21-B20

Table 5. 2-Wire Control Interface Characteristics1,2,3

(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)

Parameter

Symbol Test Condition

Min

Typ

Max

Unit

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 Hold4,5

SCLK input to SDIO Setup (STOP)

STOP to START Time

SDIO Output Fall Time

fSCL

tLOW

tHIGH

tSU:STA

tHD:STA

tSU:DAT

tHD:DAT

tSU:STO

tBUF

tf:OUT

0

—

1.3

—

0.6

—

0.6

—

0.6

—

100

—

0

—

0.6

—

1.3

—

—

20

+

0.1

---C----b----

1 pF

400

kHz

—

µs

—

µs

—

µs

—

µs

—

ns

900

ns

—

µs

—

µs

250

ns

SDIO Input, SCLK Rise/Fall Time

tf:IN

tr:IN

—

20

+

0.1

---C----b----

1 pF

300

ns

SCLK, SDIO Capacitive Loading

Cb

—

—

50

pF

Input Filter Pulse Suppression

tSP

—

—

50

ns

Notes:

1. When VIO = 0 V, SCLK and SDIO are low-impedance. 2-wire control interface is I2C compatible.

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 Si4720/21 delays SDIO by a minimum of 300 ns from the VIH threshold of SCLK to comply with the minimum

tHD:DAT specification.

5. The maximum tHD:DAT has only to be met when fSCL = 400 kHz. At frequencies below 400 KHz, tHD:DAT may be

violated as long as all other timing parameters are met.

8

Rev. 1.0

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