DS_6613_018
78M6613 Data Sheet
1.2.5
Temperature Sensor
The 78M6613 includes an on-chip temperature sensor implemented as a bandgap reference. It is used
to determine the die temperature. The MPU reads the temperature sensor output during alternate
multiplexer cycles. The primary use of the temperature data is to determine the magnitude of
compensation required to offset the thermal drift in the system (see
1.2.6
Functional Description
The AFE functions as a data acquisition system, controlled by the MPU. The input signals (A0, A1, A2,
and A3) are sampled and the ADC counts obtained are stored in CE DRAM where they can be accessed
by the CE and, if necessary, by the MPU. Alternate multiplexer cycles are initiated less frequently by the
MPU to gather access to the slow temperature signal.
VREF
∆Σ
ADC
CONVERTER
VBIAS
MUX
V3P3A
VBIAS
-
+
TEMP
VREF
CROSS
CK32
FIR_DONE
FIR_START
4.9152 MHz
VREF
FIR
A0
A1
A2
A3
MUX
MUX
CTRL
Figure 2: AFE Block Diagram
Rev. 1.1
7
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
