LPC47M192 datasheet(134/228 Pages) SMSC

134 / 228 page

SMSC DS – LPC47M192

Page 134

Rev. 03/30/05

DATASHEET

SAMPLING ORDER

Remote Diode Temp Reading 1

Ambient Temperature reading

HVCC/+3.3HVSB reading

+12V (If selected) reading

+5V reading

+3.3V reading

+2.5V reading

Vccp (processor) reading

Remote Diode Temp Reading 2

+1.8V reading

+1.5V reading

When the continuous monitoring function is started, it cycles through each measurement in sequence, and it

continuously loops through the sequence approximately once every 542.336 ms (or 67.792ms – see above). Each

measured value is compared to values stored in the Limit registers. When the measured value violates (or is equal to)

the programmed limit the Hardware Monitor Block will set a corresponding status bit in the Interrupt Status Registers.

The results of the sampling and conversions can be found in the Value RAM and are available at any time.

7.18.3.4.2

Cycle Monitoring Mode

In cycle monitoring mode, the part completes all sampling and conversions, then waits to repeat the process. It

repeats the sampling and conversion process every second (1.4 sec max). The sampling and conversion of each

voltage and temperature reading is performed once every monitoring cycle. This is a power saving mode.

The cycle monitoring function is started by doing a write to the Configuration Register, setting the Start bit (Bit 0) high.

The part then performs a “round robin” sampling of the inputs, in the order shown above.

When the cycle monitoring function is started, it cycles through each measurement in sequence, and it performs a

single conversion for each voltage and temperature approximately once every second. Each measured value is

compared to values stored in the Limit registers. When the measured value violates (or is equal to) the programmed

limit the Hardware Monitor Block will set a corresponding status bit in the Interrupt Status Registers

The results of each sampling and conversion can be found in the Value RAM and are available at any time, however,

they are only updated once every 1-1.4 seconds.

7.18.3.5

Interrupt Status Registers

The Hardware Monitor Block contains a pair of interrupt status registers. These registers are used to reflect the state

of all temperature and voltage out-of-limit/equal-limit error conditions and diode fault conditions that the Hardware

Monitor Block monitors for. When an error occurs during the conversion cycle, its corresponding bit is set in its

respective interrupt status register. The status register bits are updated continuously through each monitoring cycle.

If a measurement is within (and not equal to) limits or if there is no diode fault, the corresponding status register bit

will be cleared to ‘0’. If the measurement is equal to the limit value or out of limit or if there is a diode fault, the

corresponding status register bit will be set to ‘1’.

The diode fault conditions are described in the “External

Temperature Measurement” section. Reading the status register does NOT clear its contents. These registers

default to 0x00 on HVCC POR and Initialization.

7.18.3.6

Low Power Modes

The Hardware Monitor Block can be placed in a low-power mode by writing a ‘0’ to the Configuration Register (0x40).

The low power mode that is entered is either sleep mode or shutdown mode as selected using bit 0 of the Special

Function Register (4F). These modes do not reset any of the registers of the Hardware Monitor Block.

LPC47M192 Datasheet(PDF) 134 Page - SMSC Corporation

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