AT90PWM161 Atmel Corporation, AT90PWM161 Datasheet - Page 191
AT90PWM161
Manufacturer Part Number
AT90PWM161
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT90PWM161.pdf
(325 pages)
Specifications of AT90PWM161
Flash (kbytes)
16 Kbytes
Pin Count
20
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
20
Ext Interrupts
3
Usb Speed
No
Usb Interface
No
Spi
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
3
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.25
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
1
Output Compare Channels
8
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT90PWM161-16MN
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Part Number:
AT90PWM161-WN
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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15.3
15.3.1
15.3.2
7734P–AVR–08/10
Register Description
BGCCR – Bandgap Calibration Current Register
BGCRR – Bandgap Calibration Resistor Register
Bit
Read/Write
Initial Value
• Bit 7:4 – Res: Reserved Bit
This bit is reserved for future use.
• Bit 3:0 – BGCC3:0: BG Calibration of PTAT Current
These bits are used for trimming of the nominal value of the bandgap reference voltage. These bits are
binary coded, so the lowest value for Vbg is reached when BGCC3:0 is 0000 and the maximum value
when BGCC3:0 is 1111. The step size is approximately 5 mV.
Updating the BGCC bits will affect the BOD detection level. The BOD will react quickly to the new
detection level.
Bit
Read/Write
Initial Value
• Bit 7:4 – Res: Reserved Bit
This bit is reserved for future use.
• Bit 3:0 – BGCR3:0: BG Calibration of Resistor ladder
These bits are used for temperature gradient adjustment of the bandgap reference.
Vbg as a function of temperature. Vbg has a positive temperature coefficient at low temperatures and neg-
ative temperature coefficient at high temperatures. Depending on the process variations, the top of the
Vbg curve may be located at higher or lower temperatures.
To minimize the temperature drift in the temperature range of interest, BGCRR is used to adjust the top of
the curve towards the centre of the temperature range of interest. The BGCRR bits are thermometer coded,
resulting in 5 possible settings: 0000, 0001, 0011, 0111, 1111. The value 0000 shifts the top of the Vbg
curve to the highest possible temperature, and the value 1111 shifts the top of the Vbg curve to the lowest
possible temperature.
-
-
7
-
0
7
-
0
6
-
-
0
6
-
-
0
5
-
-
0
5
-
-
0
4
-
-
0
4
-
-
0
3
BGCC3
R/W
1
3
BGCR3
R/W
1
2
BGCC2
R/W
0
2
BGCR2
R/W
0
1
R/W
0
1
R/W
0
BGCC1
BGCR1
AT90PWM81
Figure 15-2
0
BGCC0
R/W
0
0
BGCR0
R/W
0
BGCCR
BGCRR
illustrates
191
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