CC3235MODASF datasheet(51/100 Pages) TI1

51 / 100 page

POWER

OFF

HW INIT

FW INIT

APP CODE

EXECUTION

VBAT

nRESET

STATE

RESET

32-kHz

RTC CLK

APP CODE

LOAD

CC3235MODAS, CC3235MODASF

www.ti.com

SWRS233 – OCTOBER 2019

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Product Folder Links: CC3235MODAS CC3235MODASF

Specifications

5.19 Timing and Switching Characteristics

5.19.1 Power-Up Sequencing

For proper start-up of the CC3235MODAx module, perform the recommended power-up sequencing as

follows:

1. Tie VBAT1 (pin 37) and VBAT2 (pin 40) together on the board.

2. Hold the nRESET pin low while the supplies are ramping up.

Figure 5-6 shows the reset timing diagram for the first-time power-up and reset removal.

Figure 5-6. First-Time Power-Up and Reset Removal Timing Diagram

Table 5-11 lists the timing requirements for the first-time power-up and reset removal.

Table 5-11. First-Time Power-Up and Reset Removal Timing Requirements

ITEM

NAME

DESCRIPTION

MIN

TYP

MAX UNIT

nReset time

nReset timing after VBAT supplies are stable

Hardware wake-up time

Time taken by ROM

firmware to initialize

hardware

Includes internal 32-kHz XOSC settling time

1.1

App code load time for

CC3235MODAS

Image size (KB) × 1.7 ms

App code load time for

CC3235MODASF

Image size (KB) × 0.06 ms

5.19.2 Power-Down Sequencing

For proper power down of the CC3235MODAx module, ensure that the nRESET (pin 35) and nHIB (pin 4)

pins have remained in a known state for a minimum of 200 ms before removing power from the module.

5.19.3 Device Reset

When a device restart is required, issue a negative pulse to the nRESET pin. Ensure the reset is properly

applied: A negative reset pulse (on pin 35) of at least 200-mS duration.

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