Deep Sleep Mode

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Deep Sleep Mode

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NXP Employee
NXP Employee
Content originally posted in LPCWare by tweber on Tue Nov 13 08:43:38 MST 2012
Hello,

I tried the example code for deep sleep mode on the coineltech LPC1788 header board, but the current consumption is not going as low as I expected.
The toolchain I used is crossstudio from Rowley.

In the datasheet I found for deep sleep mode IDD(REG)(3V3) = 550  µA,

My measurement of the current flowing into the board is always around 40 mA, no matter if running while(1); or entering a sleep/power mode.

Any hints?

Regards,
Thomas



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NXP Employee
NXP Employee
Content originally posted in LPCWare by tweber on Wed Nov 14 03:42:33 MST 2012
The test program shows, that the micro was not able to enter the sleep modes.
The problem was the connected debugger and a missing power cycle.

Now I have some numbers.
The power source is connected to a 3.3 V pin.
The current measurement is done after pressing b (Benchmark)

1. Active Mode, Core Freq  12 MHz, PLL0 Disabled, PCLK/4, GPIO+Uart0 Enabled
2. Active Mode, Core Freq  48 MHz, PLL0 Enabled,  PCLK/4, GPIO+Uart0 Enabled
3. Active Mode, Core Freq  96 MHz, PLL0 Enabled,  PCLK/4, GPIO+Uart0 Enabled
4. Active Mode, Core Freq 120 MHz, PLL0 Enabled,  PCLK/4, GPIO+Uart0 Enabled
s. Sleep Mode, PCLK/4, GPIO+Uart0 Enabled
S. Deep Sleep Mode
p. Power-down Mode
P. Deep Power-down Mode
b. Set  Mode (disable UART) after next selection

1 53.7 mA
2 66.9 mA
3 84.3 mA
4 97.3 mA
s 50.7 mA
S 45.4 mA
p 45.0 mA
P 27.2 mA
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NXP Employee
NXP Employee
Content originally posted in LPCWare by Daniel Widyanto on Tue Nov 13 21:21:33 MST 2012
Have you read this : AN11096 - Using the LPC178x/7x power modes (http://www.nxp.com/documents/software/AN11096.zip) ?
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