ATmega169P Automotive Atmel Corporation, ATmega169P Automotive Datasheet - Page 268

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ATmega169P Automotive

Manufacturer Part Number
ATmega169P Automotive
Description
Manufacturer
Atmel Corporation

Specifications of ATmega169P Automotive

Flash (kbytes)
16 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
54
Ext Interrupts
17
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Segment Lcd
100
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
268
ATmega169P Automotive
Note:
If the ADC is not to be used during scan, the recommended input values from
be used. The user is recommended not to use the Differential Amplifier during scan. Switch-Cap
based differential amplifier requires fast operation and accurate timing which is difficult to obtain
when used in a scan chain. Details concerning operations of the differential amplifier is therefore
not provided.
The AVR ADC is based on the analog circuitry shown in
mation algorithm implemented in the digital logic. When used in Boundary-scan, the problem is
usually to ensure that an applied analog voltage is measured within some limits. This can easily
be done without running a successive approximation algorithm: apply the lower limit on the digi-
tal DAC[9:0] lines, make sure the output from the comparator is low, then apply the upper limit
on the digital DAC[9:0] lines, and verify the output from the comparator to be high.
The ADC need not be used for pure connectivity testing, since all analog inputs are shared with
a digital port pin as well.
When using the ADC, remember the following
• The port pin for the ADC channel in use must be configured to be an input with pull-up disabled
• In Normal mode, a dummy conversion (consisting of 10 comparisons) is performed when
• The DAC values must be stable at the midpoint value 0x200 when having the HOLD signal low
As an example, consider the task of verifying a 1.5V ± 5% input signal at ADC channel 3 when
the power supply is 5.0V and AREF is externally connected to V
The recommended values from
rithm in
“Actions” describes what JTAG instruction to be used before filling the Boundary-scan Register
with the succeeding columns. The verification should be done on the data scanned out when
scanning in the data on the same row in the table.
to avoid signal contention.
enabling the ADC. The user is advised to wait at least 200ns after enabling the ADC before
controlling/observing any ADC signal, or perform a dummy conversion before using the first
result.
(Sample mode).
Table
1. Incorrect setting of the switches in
the part. There are several input choices to the S&H circuitry on the negative input of the out-
put comparator in
Bandgap reference source, or Ground.
24-4. Only the DAC and port pin values of the Scan Chain are shown. The column
The lower limit is:
The upper limit is:
Figure
Table 24-3
24-9. Make sure only one path is selected from either one ADC pin,
1024 1.5V 0,95 5V
1024 1.5V 1.05 5V
Figure 24-9
are used unless other values are given in the algo-
will make signal contention and may damage
Figure 24-9
=
=
291
323
CC
=
=
.
0x123
0x143
with a successive approxi-
Table 24-3
7735B–AVR–12/07
should

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