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SI4702-C19

BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS

Silicon Laboratories 

Si4702/03-C19

Table 4. Reset Timing Characteristics (Busmode Select Method 1)1,2,3

Parameter

Symbol

Test Condition

Min

Typ

Max Unit

RSTpulse width and GPIO3 Setup tGSRST14

to RST

GPIO3 = 0

100

—

—

µs

SEN and SDIO Setup to RST

tSRST1

30

—

—

ns

SEN, SDIO, and GPIO3 Hold from

RST

tHRST1

30

—

—

ns

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 3-wire Mode, the user must ensure that a rising edge of SCLK 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 1st start condition.

4. If GPIO3 is driven low by the user, then minimum tGSRST1 is only 30 ns. If GPIO3 is hi-Z, then minimum tGSRST1 is

100 µs, to provide time for an on-chip 1 M pulldown device (active while RST is low) to discharge the pin.

70%

RST

30%

tGSRST1

tHRST1

70%

GPIO3

30%

tSRST1

SEN, 70%

SDIO 30%

Figure 1. Reset Timing Parameters for Busmode Select Method 1 (GPIO3 = 0)

6

Rev. 1.1

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