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DS28DG02E-3C+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
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Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata
.
GENERAL DESCRIPTION
The DS28DG02 combines 2Kb (256 x 8) EEPROM
with 12 PIO lines, a real-time clock (RTC) and
calendar with alarm function, a CPU reset monitor, a
battery monitor, and a watchdog. Communication
with the device is accomplished with an industry-
standard SPI™ interface. The user EEPROM is
organized as four blocks of 64 bytes each with
single-byte and up to 16-byte page write capability.
Additional registers provide access to PIOs and to
setup functions. Individual PIO lines can be
configured as inputs or outputs. The power-on state
of PIOs programmed as outputs is stored in
nonvolatile (NV) memory. All PIOs may be
reconfigured by the user through the serial interface.
The RTC/calendar operates in the 12/24-hour format
and automatically corrects for leap years. Battery
monitor threshold and watchdog timeout are user-
programmable through NV registers. The reset
monitor generates a reset to the CPU if the voltage at
the V
CC
pin falls below the factory-set limit. The reset
output includes a debounce circuit for manual
pushbutton reset.
APPLICATIONS
Asset-Tracking Systems
Broadband Access Network Equipment
Patient-Monitoring Systems
Home Lighting Control Systems
Holter Heart Monitors
Typical Operating Circuit appears on page 32.
Pin Configuration appears on page 33.
FEATURES
2Kb (256 x 8) EEPROM Organized in Four
64-Byte Blocks
Single Byte and Up to 16-Byte EEPROM Write
Sequences
EEPROM Write-Protect Control Pin Protects
1, 2, or All 4 Blocks
Endurance 200k Cycles per Page at +25°C;
10ms (max) EEPROM Write Cycle
SPI Serial Interface Supporting Modes (0,0)
and (1,1) at Up to 2MHz Clock Frequency
12 PIO Lines with LED Drive Capability
Each PIO is Configured to Input or Output,
Open-Drain/Push-Pull on Startup by Stored
Value
All PIOs are Reconfigurable After Startup
RTC/Calendar/Alarm with BCD Format and
Leap-Year Compensation
RTC Controlled Through 32.768kHz, 12.5pF
Crystal or External TCXO
CPU Reset Through Fast-Response Precision
V
CC
Monitor with Hysteresis or Pushbutton
Battery Monitor 2.5V, 2.25V, 2.0V, 1.75V, -5%
Watchdog Timer 1.6s, 0.8s, 0.4s, 0.2s (typ)
Unique Factory-Programmed 64-Bit Device
Registration Number
Operating Range: 2.2V to 5.25V,
-40°C to +85°C
±4kV IEC 1000-4-2 ESD Protection Level
(Except Crystal Pins)
Available in 28-Lead, 4.4mm TSSOP or
36-Lead 6mm × 6mm QFN Package
ORDERING INFORMATION
PART TEMP RANGE V
CC
TRIP PIN-PACKAGE PKG CODE
DS28DG02E-3C+ -40°C to +85°C 3.3V -5% 28 TSSOP-EP
*
(4.4mm) U28E+5
DS28DG02E-3C+T -40°C to +85°C 3.3V -5% 28 TSSOP-EP
*
T&R U28E+5
DS28DG02G-3C+ -40°C to +85°C 3.3V -5% 36 TQFN-EP
*
(6mm × 6mm) T3666+3
DS28DG02G-3C+T -40°C to +85°C 3.3V -5% 36 TQFN-EP
*
T&R T3666+3
*EP = Exposed Paddle.
+Denotes lead-free/RoHS compliant device.
For additional V
CC
monitor trip points or other device options, contact the factory.
Note: Registers are capitalized for clarity.
SPI is a trademark of Motorola, Inc.
DS28DG02
2Kb SPI EEPROM with PIO, RTC,
Reset, Battery Monitor, and Watchdog
www.maxim-ic.com
11/09
EV KIT AVAILABLE
DS28DG02: 2Kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog
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ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground -0.5V, +6V
Maximum Current SO, ALMZ, RSTZ, WDOZ Pins
20mA
Maximum Current Each PIO Pin
50mA
Maximum GND and V
CC
Current 270mA
Operating Temperature Range
-40°C to +85°C
Junction Temperature
+150°C
Storage Temperature Range
-55°C to +125°C
Soldering Temperature
See IPC/JEDEC J-STD-020
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.
ELECTRICAL CHARACTERISTICS
(T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Battery monitor off 2.2 5.25
Supply Voltage V
CC
Battery monitor enabled 2.7 5.25
V
Battery Voltage V
BAT
(Note 1) 1.5 3.0 V
CC
V
RTC oscillator off 2
RTC oscillator on 0.4 10
Battery Current (V
BAT
= 3.0V,
Note 1)
I
BAT
RTC oscillator on, +25°C 4.7
µA
Standby Current (Note 2) I
CCS
SPI idle, ALMZ, WDOZ,
RTSZ high, V
CC
= 5.25V,
RTC oscillator on, all
PIOs grounded
60 100 µA
Operating Current I
CCA
Reading EEPROM at 2
Mbps, ALMZ, WDOZ,
RTSZ high, V
CC
= 5.25V,
RTC oscillator on, all
PIOs grounded
550 800 µA
Programming Current I
PROG
V
CC
= 5.25V 600 1000 µA
V
CC
Monitor Trip Point V
TRIP
(Note 3) 2.97 3.05 3.14 V
+25°C
-1.5 +1.5
V
CC
Monitor Trip-Point
Tolerance
V
TRIPTOL
-40°C to +85°C -2.5 +2.5
%V
TRIP
V
CC
Monitor Hysteresis V
HYST
0.4 0.5 0.6 %V
TRIP
Power-Up Wait Time t
POIP
60 µs
EEPROM
Programming Time t
PROG
10 ms
Endurance N
CYCLE
At +25°C (Notes 4, 5) 200k —
Data Retention t
RET
At +85°C (Notes 5, 6) 40 years
REAL-TIME CLOCK
Frequency Deviation
F
(Notes 5, 7) -46 +46 PPM
PIO PINS (See Figures 21, 22, 23)
V
CC
= 2.2V 6 9.5
V
CC
= 3.3V 12.5 22.0
LOW-Level Output Current at
V
OL
= 0.5V (Note 8)
I
OL
V
CC
= 5.25V 19 30
mA
V
OH
= 2.4V, V
CC
= 3.3V 6.5 11.0 HIGH-Level Output Current
(Note 8)
I
OH
V
OH
= 4.5V, V
CC
= 5.25V 12.5 18.0
mA
DS28DG02: 2Kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog
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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LOW-Level Input Voltage V
IL
0.8 V
HIGH-Level Input Voltage V
IH
0.7 ×
V
CC
V
CC
+
0.5V
V
Low-current mode
(Note 9)
1
Output Transition Time t
OT
High-current mode
(Note 10)
25
µs
Power-On Setting Time
t
POS
High-current mode
(Note 11)
25 µs
PIO Read Setup Time t
PS
(Note 5) 100 ns
PIO Read Hold Time t
PH
(Note 5) 100 ns
Leakage Current I
L
High impedance, at
V
CCMAX
-1 +1 µA
RSTZ PIN (Note 12) (See Figures 6, 7)
LOW-Level Output Voltage V
OL
At 4mA sink current 0.3 V
LOW-Level Input Voltage V
IL
0.3 ×
V
CC
V
Input Leakage Current I
L
-1 +1 µA
Minimum V
CC
for Valid RSTZ V
POR
(Notes 5, 13) 2.13 V
RSTZ Pulse Duration t
RST
176 328 532 ms
Manual Reset Pulse Width t
MPW
1 µs
Manual Reset Release
Threshold
V
TRMS
(Note 14) V
IL
V
Manual Reset Debounce Time t
DEB
t
RST
ms
RSTZ Delay t
DEL
V
CC
falling below V
TRIP
(Note 15)
90 µs
ALMZ, WDOZ PINS
LOW-Level Output Voltage V
OL
At 4mA sink current 0.3 V
WDI PIN
LOW-Level Input Voltage V
IL
0.3 ×
V
CC
V
HIGH-Level Input Voltage V
IH
0.7 ×
V
CC
V
CC
+
0.5V
V
Input Leakage Current I
L
-1 +1 µA
Minimum Input Pulse Width t
MPW
1 µs
Watchdog Timeout t
WD
User programmable
0.88
0.44
0.22
0.11
1.64
0.82
0.41
0.20
2.66
1.33
0.67
0.33
s
WPZ, SI, SCK, CSZ PINS
LOW-Level Input Voltage V
IL
0.3 ×
V
CC
V
HIGH-Level Input Voltage V
IH
0.7 ×
V
CC
V
CC
+
0.5V
V
Input Leakage Current I
L
-1 +1 µA
SO PIN
LOW-Level Output Voltage V
OL
At 1mA sink current and
V
CCmin
0.2 V
HIGH-Level Output Voltage V
OH
At 1mA source current
0.7 ×
V
CC
V
Output Leakage Current I
L
High impedance, at
V
CCmax
-1 +1 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34

DS28DG02E-3C+

Mfr. #:
Buy DS28DG02E-3C+
Manufacturer:
Maxim Integrated
Description:
EEPROM 2Kb SPI EEPROM w/PIO RTC/Rst/Bat Mtr/Wtdg
Lifecycle:
New from this manufacturer.
Delivery:
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