TIDA-010224Additional Information for Low-Power Consumption Design

Abstract

TIDA-010224 is designed as a reference for low-power Wi-Fi® cameras capable of operating from battery supplies. In order to extend battery lifetime as much as possible, most sockets are chosen to have a shutdown current in the nA range (as shown in Figure 1-1) and the TPS63802 high-efficiency buck-boost is used. In order to better understand more easily evaluate TIDA-010224, this application note describes a few additional use cases, how to set up the compiler environment if code changes are needed, how to update the firmware of CC3235 and OA7000, and how to test these use cases.

Figure 1-1 TIDA-010224 Hardware Design Structure

Trademarks

Code Composer Studio™ and Simplelink™ are trademarks of Texas Instruments.

FreeRTOS™ is a trademark of Real Time Engineers Ltd.

Wi-Fi® is a registered trademark of Wi-Fi Alliance.

All trademarks are the property of their respective owners.

1 Introduction

Below are additional test cases demonstrating the design's low power consumption. In some cases build of material (BOM) and firmware changes are required.

Adding test cases:

Testing current in hibernate mode
Testing current in LPDS mode
Testing average current under Intermittently connecting mode (sending 100 data to server)
Testing average current under always connecting mode (sending 100 data to server)
Test key step time when startup (via universal asynchronous receiver/transmitter (UART) printing or signal of connector)
Evaluate performance of video and audio

Test case Features:

The system can be put in wakeup from both Hibernate and LPDS mode via general-purpose input/output (GPIO) or real-time clock (RTC).
The current in hibernate mode is around 20 µA/5 V.
The current in LPDS mode is around 120 µA/5 V.
Startup time from hibernate to full running is less than 500 ms.
Configurable interval time in intermittently connecting mode or always connecting mode
Configurable stream transferring of only video, video and audio, video and ring

2 Hardware BOM and Firmware Modification

In order to reduce leakage current as much as possible, there are some necessary changes to implement.

Hardware bill of material (BOM) changes

Table 2-1 Table 1. BOM Changing of TIDA-010224

Change	Position	Note
Delete	CC1352 EVM board	In these test cases, no Sub-1 GHz connection.
Delete	R116, R137, R91, R152, R118, R35-R40, R127, R128
Change Net	float U4.5 pin
Change Net	Exchange resistor on R159 and R160 position	Make CC3235 can control

Firmware changes

Table 2-2 Table 2. Firmware Changing of TIDA-010224

Add Function	Detail
Hibernate mode	Enter Hibernate mode via UART input '1'. Choose which audio from, no audio/from microphone/from ring music after RTSP connected. Be wakeup by any of UART input. If there is not a saved AP list in site, enter provisioning mode after it is in wakeup. If there is a saved AP, connect with AP and prepare accepting RTSP connection after wakeup.
Intermittently Connected mode	Enter Intermittently mode via UART input '2'. Choose which audio from, no audio/from microphone/from ring music after RTSP connected. Define remote TCP server IP address. Define interval wakeup time from hibernate. Output 100 data to remote TCP server after wakeup. Wakeup by any UART input when it is in hibernate. Enter accepting RTSP connection mode after wakeup by GPIO (UART input)
Always Connected with Long Sleep mode/with IOT mode	Enter always connected mode via UART input '3' or ‘4’. Define beacon time of connecting with AP. Choose which audio from, no audio/from microphone/from ring music after RTSP connected. Define remote TCP server IP address. Define interval time of sending data to TCP server. Send out 100 data to remote TCP server after wakeup from LPDS mode by RTC. Wakeup by any UART input when it is in LPDS. Enter accepting RTSP connection mode after wakeup by GPIO (UART input).
Measure Time of Key action mode	Enter measure time mode via UART input '5’. Define remote TCP server IP address. Send 10 pages image data to TCP server after triggered by any UART input. Print timestamp of key action, same time, output HW signal via CC3235 GPIO_06 pin.