Battery Management System for the entire circuit | Dialog Semiconductor customer support - 亚博全网,亚博电竞菠菜,亚博国际官网平台网址

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Fri, 2019-12-06 11:45

Goluguri Sandee...

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Battery Management System for the entire circuit

Hi,

I was looking at DA14695 for my wearable application and came across the integrated power management system.

I want to know if this can be used as a battery management system for the entire circuit, meaning, can I use the power rails to power my other sensors (running at 1.8V).

Secondly, I want to run the entire circuit at 1.8V. How do I shift the running voltage from 3.3 to 1.8 V, while running on the battery?

Please redirect me to any example circuit where the DA1469x is powered directly from the battery and I can control the GPIO running voltages.

Thank you,

Sandeep.

Keywords:

power management

Device:

DA1469x

Fri, 2019-12-06 15:55

PM_Dialog

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Hi Sandeep,

I would suggest you to have a look at Figure 15: Power Management Unit Architecture in the DA1468x datasheet. Since that you would like to power up the device via battery, the VBAT1 should be between 2.4V – 4.75V. Thereis not any reference application with which is powered directly thought battery. In case of 1V8 power rail, you could use it in order to power up the peripherals. According to datasheet, V30, VDD1V8, VDD1V8P power rails are available while in Sleep mode as well. Please check the following macros. The flash is also connected to 1V8.

#define dg_configFLASH_CONNECTED_TO (FLASH_CONNECTED_TO_1V8)

#define dg_configFLASH_POWER_DOWN (0)

#define dg_configPOWER_1V8_ACTIVE (1)

#define dg_configPOWER_1V8_SLEEP (1)

You can use hw_gpio_configure_pin_power() in order to configure power source for pin output.

Thanks, PM_Dialog

Fri, 2019-12-06 16:05

Goluguri Sandee...

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Hi PM_Dialog,

Thanks for the response.

I would like to know if using an external Battery management system is preferred for applications or the one integrated PMIC can handle the loads?

The sensor typically uses 15ma of current @ 1.8 V. But has frequent current fluctuations

Can integrated power management handle load fluctuations? Where can i find the information about the PMIC?

Thanks, Sandeep

Wed, 2019-12-11 16:16

PM_Dialog

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Hi Sandeep,

I will check it internally and I will get back to you as soon as possible.

Thanks, PM_Dialog

Thu, 2019-12-12 15:19

ED_Dialog

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Hello Sandeep,

One option could be to use the DA9230. This is part of our Nano-PMIC family.

DA9230有:

1 x Buck: Vin: 2.5 - 5.5 V, Vout: 0.6 - 1.9 V, IOUT: 300mA, IQ:750nA (No load).
I2C access,
1 x GPO,
Fault protection,
1.65mm x 1.25m,

The DA9231 is the same device with an addtional LDO:

Vin: 1.8 - 5.5 V, Vout: 0.8 - 3.3 V, IOUT: 100mA, Iq: 600nA (no load).

Using this device will allow the BLE IC to go into a low power state whilst keep sensors or other IC enabled.

In terms of battery the DA9070/73 could be of use. It has charger, power-path, fuel guage, boost, buck and 3 x LDOs. This might be slighly over kill for your application.

What issues do you see with the power managment in the BLE IC?

Kind regards,
Elliott

Fri, 2019-12-13 11:27

PS_Dialog

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Hi Sandeep,

SIMO DC-DC converter has two rails V18P which can deliver 50 mA when DA1469x is in active. The voltage range of this power rail is 1.8V +/- 5%.

Detailed specification can be found in our datasheet at page 70-72, table 17:

https: //www.xmece.com/sites/default/files/da1469x_datashe...

How much is the current fluctuation of your sensor?

BR, Paolo