SAH-C515 SIEMENS [Siemens Semiconductor Group], SAH-C515 Datasheet - Page 108

• Manufacturer Part Number: SAH-C515
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

The external reference voltage supply need only be applied when the A/D converter is used,
otherwise the pins
meet some requirements concerning the level of
supply voltage (see also "A/D Converter Characteristics" in the data sheet).
lf the above mentioned operating conditions are not met the accuracy of the converter may be
decreased.
Furthermore, the analog input voltage
(
which will also affect the accuracy of the other input channels.
Semiconductor Group
V
AREF
– The voltage
– The voltage
– The differential output impedance of the analog reference supply voltage should be less than
V
V
1 kW.
+ 0.2 V). Otherwise, a static input current might result at the corresponding analog input
AREF
AGND
=
=
V
V
CC
SS
+ 0.25 V
+ 0.2 V
V
V
V
AREF
AGND
AREF
must meet the following specification :
must meet a similar specification :
and
V
AGND
may be left unconnected. The reference voltage supply has to
V
AINPUT
must not exceed the range from (
6-65
V
AGND
On-Chip Peripheral Components
and
V
AREF
and the output impedance of the
V
AGND
– 0.2 V) to
C515