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WM8310 Datasheet(PDF) 286 Page - Wolfson Microelectronics plc

Part # WM8310
Description  Processor Power Management Subsystem
PDF  291 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8310 Datasheet(HTML) 286 Page - Wolfson Microelectronics plc

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WM8310
Pre-Production
w
PP, May 2012, Rev 3.1
286
Under the circuit configuration above, the NTC bias resistors RBIAS and R1 are calculated using the
following equations:
RBIAS = ((rCOLD - rHOT) / 2.721) x R25
R1 = (0.534 x RBIAS) - (rHOT x R25)
For example, to select a 45
C Hot Battery threshold and a 0C Cold Battery threshold, the applicable
resistance ratios are rHOT = 0.4368 and rCOLD = 3.266.
Assuming a 100k
 NTC thermistor (at 25C), then R25 = 100k.
From the equations above, it follows that RBIAS = 104k (nearest E12 value 100k).
Assuming the E12 (100k
) value of RBIAS, then R1 = 9.72k (nearest E12 value 10k).



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