Changeset 2924

Timestamp:

03/10/05 04:45:34 (8 years ago)

Author:

mmh

Message:

Patch by David Knierim <david_knierim@…> to fix IN10

(+5V) scaling

I have been hunting down an issue related to the IN10 input of the
LM93. I have observed that there is a rather large error between the
actual voltage and the voltage level displayed by sensors(1) (~ .12V).

Please find attached a small patch that fixes this problem. The data
sheet is very ambiguous and I and another engineer made the same mistake
calculating the voltage per DAC step the first time we read the spec sheet.

The confusion stems from an entry in the "maximum voltage" column that
is higher than the value in the "absolute maximum range" column. For 5V
only, the value in the "register reading at maximum voltage" is for the
voltage in the "absolute maximum range", NOT the "maximum voltage". Whew!

Location:

lm-sensors/trunk

Files:

• CHANGES (modified) (1 diff)
• kernel/chips/lm93.c (modified) (1 diff)

lm-sensors/trunk/CHANGES

@@ -36 +36 @@
                Support VID on the IT8712F
   Module lm90: Fix MAX6657, MAX6658 and MAX6659 detection
+  Module lm93: Fix IN10 (+5V) scaling
   Module mic74: New
   Module w83781d: Revert AS99127F temp2 and temp3 computation change

lm-sensors/trunk/kernel/chips/lm93.c

@@ -690 +690 @@
 static const unsigned long lm93_vin_val_max[16] = {
         1236, 1236, 1236, 1600, 2000, 2000, 1600, 1600,
-        4400, 6667, 3333, 2625, 1312, 1312, 1236, 3600,
+        4400, 6500, 3333, 2625, 1312, 1312, 1236, 3600,
 };
 /*