BCM20730 Data Sheet
Microprocessor Unit
Internal Reset
Figure 4: Internal Reset Timing
VDDO POR delay
~ 2 ms
VDDO
VDDO POR threshold
VDDC POR threshold
VDDO POR
VDDC
VDDC POR delay
~ 2 ms
VDDC POR
Crystal
warm-up
delay:
~ 5 ms
Baseband Reset
Start reading EEPROM and
firmware boot
Crystal Enable
External Reset
The BCM20730 has an integrated power-on reset circuit that completely resets all circuits to a known power-
on state. An external active low reset signal, RESET_N, can be used to put the BCM20730 in the reset state. The
RESET_N pin has an internal pull-up resistor and, in most applications, it does not require that anything be
connected to it. RESET_N should only be released after the VDDO supply voltage level has been stabilized.
Figure 5: External Reset Timing
Pulse width
>50 µs
RESET_N
Crystal
warm-up
delay:
~ 5 ms
Baseband Reset
Start reading EEPROM and
firmware boot
Crystal Enable
BROADCOM
®
September 9, 2013 • 20730-DS108-R
Page 22
BROADCOM CONFIDENTIAL
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