SI4712-B30 Datasheet, PDF (6/42 Pages) Silicon Laboratories – FM RADIO TRANSMITTER WITH RECEIVE POWER SCAN

Si4712/13-B30
Table 4. Reset Timing Characteristics^1,2,3
(V_DD = 2.7 to 5.5 V, V_IO = 1.5 to 3.6 V, T_A = –20 to 85 °C)
Parameter
Symbol
Min
Typ
Max
Unit
RST Pulse Width and GPO1, GPO2/INT Setup to RST^
t_SRST
100
—
—
µs
GPO1, GPO2/INT Hold from RST
t_HRST
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 t_SRST is only 30 ns. If GPO1 or GPO2 is hi-Z, then
minimum t_SRST is 100 µs, to provide time for on-chip 1 M devices (active while RST is low) to pull GPO1 high and
GPO2 low.
t_SRST
t_HRST
RST 70%
30%
GPO1 70%
30%
GPO2/ ^70%
INT ^30%
Figure 1. Reset Timing Parameters for Busmode Select
6
Rev. 1.1