LM93 datasheet(17/95 Pages) TI1

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LM93

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SNAS210E – DECEMBER 2003 – REVISED MARCH 2013

8–Bit Result

Percentage Thottled

Exactly 0%

Between 0% and 0.39%

Between 0.39% and 0.78%

Between (n-1)/256 and n/256

253

Between 98.4% and 98.8%

254

Between 98.8% and 99.2%

255

Greater than 99.2%

To achieve the second goal, the LM93 has several comparators that compare the measured percentage

reading against several fixed and 1 variable value. The variable value is user programmable.

The result of these comparisons generates several error status bits described in the following table:

SPACER

Status Description

Comparison Formula

100% Throttle

PROCHOT was never de-asserted

during monitoring interval.

Greater than or equal to 75% and

193

≤ measured value and not

less than 100%

100%

Greater than or equal to 50% and

129

≤ measured value < 193

less than 75%

Greater than or equal to 25% and

≤ measured value < 129

less than 50%

Greater than or equal to 12.5%

≤ measured value < 65

and less than 25%

Greater than 0% and less than

0 < measured value < 33

12.5%

Greater than 0%

0 < measured value

Greater than user limit

user limit < measured value

These status bits are reflected in the PROCHOT Error Status Registers. Each of the P1_PROCHOT and

P2_PROCHOT inputs is monitored independently, and each has its own set of status registers.

In S3 and S4/5 sleep states, the PROCHOT Monitoring function does not run. The Current Px_PROCHOT

registers are reset to 00h and the Average Px_PROCHOT registers hold their current state. Once the

sleep state changes back to S0, the monitoring function is restarted. After the first PROCHOT

measurement has been made, the measurement is written directly into the Current and Average

Px_PROCHOT registers without performing any averaging. Averaging returns to normal on the second

measurement.

3.11 PROCHOT OUTPUT CONTROL

In some cases, it is necessary for the LM93 to drive the Px_PROCHOT outputs low. There are several

conditions that cause this to happen.

The LM93 can be told to logically short the two PROCHOT inputs together. When this is done, the LM93

monitors each of the Px_PROCHOT inputs. If any external device asserts one of the PROCHOT signals,

the LM93 responds by asserting the other PROCHOT signal until the first PROCHOT signal is de-

asserted. This feature should never be enabled if the PROCHOT signals are already being shorted by

another means.

Functional Description

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