Miele T 9246 C Specifications download pdf (Page 28)

UCD9246

SLVSA34 –JANUARY 2010

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Each rail can be optionally configured to monitor a sequencing input pin for a specified period of time after it

turns on and reaches its power good threshold. If the programmable timeout is reached before the input pin state

matches its defined logic level, the rail is shut down, and a status error posted. This feature could be used, for

example, to ensure that an LDO on the board did turn on when the main system voltage came up. Each rail is

enabled independently of the other rails and has a unique timeout value; a single input pin is used as the timeout

source.

The setup of the GPIO_SEQ_CONFIG command is aided by the use of the Fusion Digital Power™ Designer,

which graphically displays relationships between rails and provides intuitive controls to allocate and configure

available resources.

The following pins are available for use as sequencing control, provided they are not being used for their primary

purpose:

PIN NAME 64-PIN

DPWM-1A IN/OUT

DPWM-1B IN/OUT

DPWM-2A IN/OUT

DPWM-2B IN/OUT

DPWM-3A IN/OUT

DPWM-4A IN/OUT

FLT-1A IN/OUT

FLT-1B IN/OUT

FLT-2A IN/OUT

FLT-2B IN/OUT

FLT-3A IN/OUT

FLT-4A IN/OUT

SRE-1A IN/OUT

SRE-1B IN/OUT

SRE-2A IN/OUT

SRE-2B IN/OUT

SRE-3A IN/OUT

SRE-4A IN/OUT

PGOOD IN/OUT

SEQ-1 IN/OUT

SEQ-2 IN

Non-volatile Memory Error Correction Coding

The UCD9246 uses Error Correcting Code (ECC) to improve data integrity and provide high reliability storage of

Data Flash contents. ECC uses dedicated hardware to generate extra check bits for the user data as it is written

into the Flash memory. This adds an additional six bits to each 32-bit memory word stored into the Flash array.

These extra check bits, along with the hardware ECC algorithm, allow for any single bit error to be detected and

corrected when the Data Flash is read.

APPLICATION INFORMATION

Automatic System Identification ( Auto-ID™)

By using digital circuits to create the control function for a switch-mode power supply, additional features can be

implemented. One of those features is the measurement of the open loop gain and stability margin of the power

supply without the use of external test equipment. This capability is called automatic system identification or

Auto-ID™. To identify the frequency response, the UCD9246 internally synthesizes a sine wave signal and

injects it into the loop at the DPWM output DAC. This signal excites the system, and the closed-loop response to

that excitation can be measured at another point in the loop. The UCD9246 measures the response to the

excitation at the EADC input. The open-loop transfer function may be calculated from the closed-loop response.

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Miele T 9246 C Specifications Page 28

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