AT89LP6440-20PU Atmel, AT89LP6440-20PU Datasheet - Page 134

• Manufacturer Part Number: AT89LP6440-20PU
• Description: MCU 8051 64K FLASH ISP 40PDIP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20PU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 20-1. DADC Block Diagram
134
AVDD
AGND
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
AT89LP6440 - Preliminary
REFERENCE
INTERNAL
1.0V
8-BIT DATA BUS
R
R
AVDD/2
Table 20-1.
Right Adjust
01FFh
FF00h
FE01h
0100h
0
INPUT
INPUT
POS.
NEG.
MUX
MUX
ADC INPUT SELECT
REGISTER (DADI)
CHANNEL SELECTION
Example ADC Conversion Codes
Left Adjust
7FC0h
C000h
4000h
8040h
0
SAMPLE &
+
-
HOLD
TRIGGER
SELECT
Overflows
DA+
Timer
DA-
Single-Ended Mode (V
AV
AV
AV
AV
DD
DD
/2 + 511/512 x V
/2 – 511/512 x V
DD
DD
/2 + 1/2 x V
/2 – 1/2 x V
ADC CTRL & STATUS
AV
REGISTER (DADC)
DD
INTERRUPT
10-BIT SAR
/2
FLAG
REF
REF
PRESCALER
REF
REF
IN
)
Differential Mode (V
15
ADC DATA REGISTER
–511/512 x V
511/512 x V
(DADH/DADL)
–1/2 x V
1/2 x V
0
REF
3706A–MICRO–9/09
REF
REF
REF
IN
+ – V
0
IN
-)