DS2252T-128-16 Maxim Integrated Products, DS2252T-128-16 Datasheet - Page 7

• Manufacturer Part Number: DS2252T-128-16
• Description: IC MICROCNTRLR 128K 16MHZ 40SIMM
• Manufacturer: Maxim Integrated Products
• Series: DS225xr

Specifications of DS2252T-128-16

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SIO, UART/USART
• Peripherals: Power-Fail Reset, WDT
• Number Of I /o: 32
• Program Memory Type: SRAM
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-SIMM
• Processor Series: DS2252T
• Core: 8051
• Data Bus Width: 8 bit
• Program Memory Size: 128 KB
• Data Ram Size: 128 KB
• Interface Type: UART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 2
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: No
• Other names: DS2252T12816

DS2252T MEMORY MAP WITH (PES = 1) Figure 4
POWER MANAGEMENT
The DS2252T monitors V
switchover to lithium backup. It uses an internal band-gap reference in determining the switch points.
These are called V
perform an interrupt vector to location 2Bh if the power-fail warning is enabled. Full processor operation
continues regardless. When power falls further to V
code execution will be performed unless power rises back above V
the R/
drops further to below V
majority of internal circuits will be disabled and the remaining nonvolatile states will be retained. The
Secure Microcontroller User’s Guide has more information on this topic. The trip points V
V
PFW
are listed in the electrical specifications.
W
signal go to an inactive (logic 1) state. V
PARTITION
FFFFh --
C000h --
B000h --
4000h --
0000h --
= NOT ACCESSIBLE
PFW
, V
PROGRAM MEMORY
CCMIN
LI
, internal circuitry will switch to the built-in lithium cell for power. The
CC
PROGRAM
NV RAM
, and V
to provide power-fail reset, early warning power-fail interrupt, and
LI
respectively. When V
7 of 16
CCMIN
CC
is still the power source at this time. When V
, the DS2252T invokes a reset state. No further
DATA MEMORY (MOVX)
CC
REAL-TIME
drops below V
CCMIN
CLOCK
. All decoded chip enables and
PFW
-- 64K
-- 16K
, the DS2252T will
CCMIN
and
CC