ZSSC3123 datasheet(21/68 Pages) ETC2

21 / 68 page

ZSSC3123

ite™ Capacitive Sensor Signal Conditioner

Data Sheet

September 29, 2011

— Rev.1.00

without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes

without notice.

21 of 67

TREF

TOFF

PTAT

RES

TEMP

)

(







Trim

Temp





Offset

CDC

TOFF





Reference

CDC

TREF





2.2.2

Temperature Measurement

The temperature signal comes from an internal PTAT (proportional to absolute temperature) circuit that is a meas-

ure of the die temperature. The PTAT (VPTAT) voltage is used in the CDC to charge an internal capacitor (CT),

while the bandgap voltage (VBG) is used to charge the offset and the reference trimmable capacitors. The CDC

temperature output (ZTEMP) is defined by equations (10) to (13):

(10)

With

(11)

With

(12)

And

(13)

Symbol

Description

ZTEMP

Measured internal temperature

RES

Programmable CDC resolution of 8, 10, 12, or 14 bits (bit setting in Table 5.4)

VPTAT

Internal PTAT voltage

VBG

Internal bandgap voltage

Temperature measurement capacitor

CTOFF

Temperature CDC zero shift

CTREF

Temperature reference capacitance

Temp_Trim

Temperature trim setting (bit setting in Table 5.4)

CDC_Offset

CDC offset trim setting (bit setting in Table 5.4)

CDC_Reference

CDC reference setting (bit setting in Table 5.4)

Note: The factory settings for Temp_Trim, CDC_Offset, and CDC_Reference are optimized for the full

temperature range of -40°C to 125°C guaranteeing a minimum effective resolution of 13 bits when 14 bits of reso-

lution is selected. Unless a different temperature range is needed, it is strongly recommended that these settings

not be changed.

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