T89C5115-TISUM Atmel, T89C5115-TISUM Datasheet - Page 19
![IC 8051 MCU FLASH 16K 28SOIC](/photos/6/82/68295/453-28-soic_sml.jpg)
T89C5115-TISUM
Manufacturer Part Number
T89C5115-TISUM
Description
IC 8051 MCU FLASH 16K 28SOIC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.T89C5115-RATIM.pdf
(113 pages)
Specifications of T89C5115-TISUM
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
20
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
89C5115-TISUM
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During a Normal
Operation (Warm Reset)
Watchdog Reset
4128G–8051–02/08
Table 13. Minimum Reset Capacitor for a 15k Pull-down Resistor
Note:
Reset pin must be maintained for at least 2 machine cycles (24 oscillator clock periods)
to apply a reset sequence during normal operation. The number of clock periods is
mode independent (X2 or X1).
A 1K resistor must be added in series with the capacitor to allow the use of watchdog
reset pulse output on the RST pin or when an external power-supply supervisor is used.
Figure 6 shows the reset circuitry when a capacitor is used.
Figure 6. Reset Circuitry for a Watchdog Configuration
Figure 7 shows the reset circuitry when an external reset circuit is used.
Figure 7. Reset Circuitry Example Using an External Reset Circuit
oscrst/vddrst
External reset
circuit
20ms
These values assume VDD starts from 0v to the nominal value. If the time between two
on/off sequences is too fast, the power-supply decoupling capacitors may not be fully
discharged, leading to a bad reset sequence.
5ms
VDD
Crst
VDD
1k
2.7µF
10µF
1ms
RST
RST pin
1k
Rrst
RST pin
To other on-board circuitry
10ms
4.7µF
15µF
Reset input circuitry
Rrst
To other on-board circuitry
Internal reset
watchdog
Reset input circuitry
Internal reset
watchdog
100ms
47µF
47µF
19
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