SI4720-B20-GM 查看數據表（PDF） - Silicon Laboratories

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SI4720-B20-GM

BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

Silicon Laboratories 

Si4720/21-B20

Table 4. Reset Timing Characteristics1,2,3

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

Parameter

Symbol

Min

Typ

Max

Unit

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

tSRST

100

—

—

µs

GPO1, GPO2/INT Hold from RST

tHRST

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 1st start condition.

3. When selecting 3-wire or SPI modes, the user must ensure that a rising edge of SCLK does not occur within 300 ns

before the rising edge of RST.

4. If GPO1 and GPO2 are actively driven by the user, then minimum tSRST is only 30 ns. If GPO1 or GPO2 is hi-Z, then

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

GPO2 low.

RST 70%

30%

tSRST

tHRST

GPO1 70%

30%

GPO2/ 70%

INT 30%

Figure 1. Reset Timing Parameters for Busmode Select

Rev. 1.0

7

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