ATA6617-P3PW Atmel, ATA6617-P3PW Datasheet - Page 228

• Manufacturer Part Number: ATA6617-P3PW
• Description: MCU W/LIN TX/5V REG/WTCDG 38VQFN
• Manufacturer: Atmel
• Series: AVR® ATA66 LIN-SBCr

Specifications of ATA6617-P3PW

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 38-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.18.11
228
Atmel ATA6616/ATA6617
Internal Voltage Reference Output
The following code example allows to read Signature Row data:
The internal voltage reference is output on XREF pin as described in
turned on (see
76). Addition of an external filter capacitor (5 - 10nF) on XREF pin may be necessary. XREF
current load must be from 1µA to 100µA with VCC from 2.7V to 5.5V for XREF = 1.1V and with
VCC from 4.5V to 5.5V for XREF = 2.56V.
XREF pin can be coupled to an analog input of the ADC.
Table 4-57.
Notes:
XREFEN
.equ TS_GAIN = 0x0005
.equ TS_OFFSET = 0x0003
LDI R30,LOW(TS_GAIN)
LDI R31,HIGH (TS_GAIN)
RCALL Read_signature_row
MOV R17,R16 ; Save R16 result
LDI R30,LOW(TS_OFFSET)
LDI R31,HIGH (TS_OFFSET)
RCALL Read_signature_row
; R16 holds TS_OFFSET and R17 holds TS_GAIN
Read_signature_row:
IN R16,SPMCSR ; Wait for SPMEN ready
SBRC R16,SPMEN ; Exit loop here when SPMCSR is free
RJMP Read_signature_row
LDI R16,((1<<SIGRD)|(1<<SPMEN)) ; We need to set SIGRD and SPMEN
together
OUT SPMCSR,R16 ; and execute the LPM within 3 cycles
LPM R16,Z
1
1
0
(2)
(1)
2. RET
1.
2.
3. In these configurations, the pin pull-up must be turned off and the pin digital output must be
4. Vcc in range 4.5 - 5.5V.
(1)
See ”Bit 1 – XREFEN: Internal Voltage Reference Output Enable” on page 235.
See ”Bit 7:6 – REFS1:REFS0: Voltage Reference Selection Bits” on page 229.
set in Hi-Z.
Internal Voltage Reference Output
Section 4.7.2.1 “Voltage Reference Enable Signals and Start-up Time” on page
REFS1
x
0
1
(2)
REFS0
1
1
x
(3)
Voltage Reference Output (I
Hi-Z, the pin can be used as AREF input or other alternate
functions.
XREF = 1.1V
XREF = 2.56V
(3)
(3)(4)
load
Table 4-57
100µA)
9132D–AUTO–12/10
if the ADC is