Timing And Switching Characteristics - Texas Instruments SimpleLink CC3135MOD Manual

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5.15 Timing and Switching Characteristics

5.15.1 Power-Up Sequencing
For proper start-up of the CC3135MOD module, perform the recommended power-up sequencing as
follows:
1. Tie V (pin 37) and V
BAT1
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.
nRESET
STATE
32-kHz
Figure 5-6. First-Time Power-Up and Reset Removal Timing Diagram
Table 5-7 describes the timing requirements for the first-time power-up and reset removal.
Table 5-7. First-Time Power-Up and Reset Removal Timing Requirements
ITEM NAME
T1 nReset time
T2 Hardware wake-up time
T3 Initialization time
5.15.2 Power-Down Sequencing
For proper power down of the CC3135MOD 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.
5.15.3 Device Reset
When a device restart is required, the user may issue a negative pulse on either the nHIB pin (pin 4) or on
the nRESET pin (pin 35), keeping the other pulled high, depending on the configuration of the platform. If
the nRESET pin is used, the user must insure the following:
• A high-to-low reset pulse (on pin 35) of at least 200-ms duration
To ensure a proper reset sequence, the user must call the sl_stop function prior to toggling the reset.
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(pin 40) together on the board.
BAT2
T1
T2
VBAT
nHIB
POWER
RESET HW INIT
OFF
XTAL
DESCRIPTION
nReset timing after VBAT supplies
are stable
Internal 32-kHz XTAL settling plus
firmware initialization time plus
radio calibration
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SWRS225B – FEBRUARY 2019 – REVISED MARCH 2020
T3
Device ready to
FW INIT
serve API calls
MIN TYP
1.35
CC3135MOD
CC3135MOD
MAX UNIT
1 ms
25 ms
s
Specifications 27