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CC3135 Datasheet(PDF) 29 Page - Texas Instruments

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Part No. CC3135
Description  SimpleLink Wi-Fi, Dual-Band Network Processor, solution for MCU applications
Download  78 Pages
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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CC3135 Datasheet(HTML) 29 Page - Texas Instruments

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POWER
OFF
HW INIT
FW INIT
Device Ready to
serve API calls
VBAT
VIO
nRESET
STATE
32-kHz
XTAL
T1
T2
T3
nHIB
RESET
29
CC3135
www.ti.com
SWAS037 – JANUARY 2019
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Product Folder Links: CC3135
Specifications
Copyright © 2019, Texas Instruments Incorporated
5.17 Timing and Switching Characteristics
5.17.1 Power Supply Sequencing
For proper operation of the CC3135 device, perform the recommended power-up sequencing as follows:
1. Tie the following pins together on the board:
VBAT (pins 37, 39, and 44)
VIO (pins 54 and 10)
2. Hold the RESET pin low while the supplies are ramping up. TI recommends using a simple RC circuit
(100 K ||, 0.01 µF, RC = 1 ms).
3. For an external RTC, ensure that the clock is stable before RESET is deasserted (high).
For timing diagrams, see Section 5.17.3.
5.17.2 Device Reset
When a device restart is required, the user may issue a negative pulse to the nRESET pin. The user must
follow one of the following alternatives to ensure the reset is properly applied:
A negative reset pulse (on pin 32) of at least 200-ms duration
If the 200-ms pulse duration cannot be ensured, a pulldown resistor of 2 MΩ must be connected to pin
52 (RTC_XTAL_N). If implemented, a shorter pulse of at least 100 µs can be used.
To ensure a proper reset sequence, the user must call the sl_stop function prior to toggling the reset.
When a reset is required, it is preferable to use the software reset instead of an external trigger.
5.17.3 Reset Timing
5.17.3.1 nRESET (32-kHz Crystal)
Figure 5-6 shows the reset timing diagram for the 32-kHz crystal first-time power-up and reset removal.
Figure 5-6. First-Time Power-Up and Reset Removal Timing Diagram (32-kHz Crystal)
Table 5-11 describes the timing requirements for the 32-kHz crystal first-time power-up and reset removal.
Table 5-11. First-Time Power-Up and Reset Removal Timing Requirements (32-kHz Crystal)
ITEM
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
T1
nReset time
nReset timing after VBAT and VIO supply are
stable
1
ms
T2
Hardware wake-up time
25
ms
T3
Initialization time
32-kHz crystal settling plus firmware
initialization time plus radio calibration
1.35
s


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