tmp88cs34ng TOSHIBA Semiconductor CORPORATION, tmp88cs34ng Datasheet - Page 126

• Manufacturer Part Number: tmp88cs34ng
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.11.7
2.11.8
(1) Analog input voltage range
(2) I/O port with analog input
(3) Reduce to noise
voltage of which out of range is forced to analog input pin, AD conversion result to unknown.
Also, this cause other analog input pin unstable.
analog input pin, don’t operate other I/O port with analog input. Because, AD accuracy
would be worse. Also, other electrically swinging port without analog input may cause noise
to near analog input pin.
STOP Modes during AD Conversion
convert operation is suspended and the AD converter is initialized. (ADCCRA and
ADCCRB are initialized to initial value.) Also, the conversion result is indeterminate.
(Conversion results up to the previous operation are cleared, so be sure to read the
conversion results before entering standby mode.) When restored from standby mode, AD
conversion is not automatically restarted, so it is necessary to restart AD conversion after
setting ADCCRA and ADCCRB. Note that since the analog reference voltage is
automatically disconnected, there is no possibility of current flowing into the analog
reference voltage.
Notice of AD converter
Voltage range of analog input (AIN0 to AIN5) must be forced from V
Analog input pins (AIN0 to AIN5) are also I/O port. During AD conversion using any
When standby mode (STOP mode) is entered forcibly during AD conversion, the AD
Analog input
supply impedance
5 kΩ (max.)
condition.
Figure 2.11.7 Analog Input Equivalent Circuit and Analog Input Pin
Figure 2.11.7 is shown as internal equivalent circuit of analog input pin.
Increasing output impedance of analog input supply, cause noise or other non-good
Therefore, output impedance of analog input supply must be less than 5kΩ.
And we recommend to connect capacitance to analog input pin.
AINx
Internal resistance
R = 5 kΩ (typ.)
88CS34-126
Internal Capacitance
C = 22 pF (typ.)
DA converter
Analog converter
TMP88CS34/CP34
SS
to V
2007-09-12
DD
. If input