MCP651_11 Datasheet, PDF (21/56 Pages) Microchip Technology – 50 MHz, 6 mA Op Amps with mCal

3.5 Calibrate/Chip Select Digital Input
This input (CAL/CS, …) is a CMOS, Schmitt-triggered
input that affects the calibration and low power modes
of operation. When this pin goes high, the part is placed
into a low power mode and the output is high-Z. When
this pin goes low, a calibration sequence is started
(which corrects V_OS). At the end of the calibration
sequence, the output becomes low impedance and the
part resumes normal operation.
An internal POR triggers a calibration event when the
part is powered on, or when the supply voltage drops
too low. Thus, the MCP652 parts are calibrated, even
though they do not have a CAL/CS pin.
MCP651/2/4/5/9
3.6 Exposed Thermal Pad (EP)
There is an internal connection between the Exposed
Thermal Pad (EP) and the V_SS pin; they must be con-
nected to the same potential on the Printed Circuit
Board (PCB).
This pad can be connected to a PCB ground plane to
provide a larger heat sink. This improves the package
thermal resistance (θ_JA).
© 2011 Microchip Technology Inc.
DS22146B-page 21