DS1672S-3+TR MAXIM [Maxim Integrated Products], DS1672S-3+TR Datasheet

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DS1672S-3+TR

Manufacturer Part Number
DS1672S-3+TR
Description
I2C 32-Bit Binary Counter RTC
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
GENERAL DESCRIPTION
The DS1672 incorporates a 32-bit counter and
power-monitoring functions. The 32-bit counter
is designed to count seconds and can be used to
derive time-of-day, week, month, month, and
year by using a software algorithm. A precision,
temperature-compensated
comparator circuit monitors the status of V
When an out-of-tolerance condition occurs, an
internal power-fail signal is generated that forces
the reset to the active state. When V
an in-tolerance condition, the reset signal is kept
in the active state for a period of time to allow
the power supply and processor to stabilize.
TYPICAL OPERATING CIRCUIT
www.maxim-ic.com
reference
CC
returns to
and
CC
.
I
2
1 of 15
C 32-Bit Binary Counter RTC
FEATURES
PIN CONFIGURATION
*Purchase of I
Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I
components in an I
to
the
TOP VIEW
32-Bit Counter
I
Automatic Power-Fail Detect and Switch
Circuitry
Power-Fail Reset Output
Low-Voltage Oscillator Operation
(1.3V min)
Trickle-Charge Capability
Underwriters Laboratory (UL) Recognized
-40°C to +85°C Operating Temperature
Range
2
C
*
I
2
Serial Interface
C
V
2
C components from Maxim Integrated Products,
BACKUP
Standard
GND
X1
X2
2
C system, provided that the system conforms
Specification
1
2
3
4
DS1672
µSOP
2
C Patent Rights to use these
DIP
SO
8
7
6
5
defined
DS1672
V
RST
SCL
SDA
CC
REV: 031406
by
Philips.

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DS1672S-3+TR Summary of contents

Page 1

GENERAL DESCRIPTION The DS1672 incorporates a 32-bit counter and power-monitoring functions. The 32-bit counter is designed to count seconds and can be used to derive time-of-day, week, month, month, and year by using a software algorithm. A precision, temperature-compensated ...

Page 2

... DS1672S-3 -40°C to +85°C DS1672S-3+ -40°C to +85°C DS1672S-33 -40°C to +85°C DS1672S-33+ -40°C to +85°C DS1672S-3/T&R -40°C to +85°C DS1672S-3+T&R -40°C to +85°C DS1672S-33/T&R -40°C to +85°C DS1672S-33+T&R -40°C to +85°C DS1672U-2 -40° ...

Page 3

ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………………………………………..-0.5V to +6.0V Operating Temperature Range (noncondensing) ...…………………………………………-40°C to +85°C Storage Temperature Range……………………………………………………………….-55°C to +125°C Soldering Temperature………………………………………….See IPC/JEDEC J-STD-020 Specification This is a stress rating only and functional operation of ...

Page 4

DC ELECTRICAL CHARACTERISTICS ( -40°C to +85°C PARAMETER V Current (Oscillator On) BACKUP V Current (Oscillator Off) BACKUP Note 5: Using the recommended crystal on X1 and X2. CRYSTAL SPECIFICATIONS PARAMETER Nominal Frequency Series ...

Page 5

AC ELECTRICAL CHARACTERISTICS ( -40°C to +85°C PARAMETER SYMBOL SCL Clock f SCL Frequency Bus Free Time Between a STOP and t BUF START Condition Hold Time (Repeated) START t HD:STA Condition LOW Period ...

Page 6

POWER-UP/POWER-DOWN CHARACTERISTICS (T = -40°C to +85°C) A PARAMETER V Detect to RST (V Falling Detect to RST (V Rising Fall Time PF(MAX) PF(MIN) V Rise Time ...

Page 7

PIN DESCRIPTION PIN NAME Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for operation with a crystal having a specified load capacitance (CL) of 6pF. For more information about crystal selection and 1, 2 X1, X2 ...

Page 8

DETAILED DESCRIPTION The DS1672 provides a 32-bit counter that increments once-per-second. The counter data is accessible 2 via serial interface. A precision, temperature-compensated, voltage reference and comparator circuit monitors V . When V CC prevent data corruption. ...

Page 9

Clock Accuracy The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional ...

Page 10

Microprocessor Monitor A temperature-compensated comparator circuit monitors the level of V fail trip point, the RST signal (open drain) is pulled active and read/write access is inhibited. When V returns to nominal levels, the RST signal is kept in the ...

Page 11

Figure 5. Programmable Trickle Charger SELECT NOTE: ONLY 1010 ENABLES TCS TCS TCS TCS BIT 7 BIT 6 BIT 5 BIT 4 TRICKLE CHARGE REGISTER SELECT SELECT DS DS ...

Page 12

I C Serial Data Bus The DS1672 supports a bidirectional I onto the bus is defined as a transmitter and a device receiving data as a receiver. The device that controls the message is called a master. The devices ...

Page 13

Figures 7 and 8 detail how data transfer is accomplished on the I R/W bit, two types of data transfer are possible: 1) Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the master ...

Page 14

Figure 6. Data Transfer on I SDA MSB SCL 1 START CONDITION Figure 7. Data Write: Slave Receiver Mode <Slave Address> <Word Address (n)> S 1101000 0 A XXXXXXXX S - START A - ACKNOW LEDGE P - STOP R/W ...

Page 15

THERMAL INFORMATION PACKAGE THETA-JA 8 DIP (300 mils) 110°C (150 mils) 170°C/W 8 µSOP (3mm) 221°C/W PACKAGE INFORMATION For the latest package outline information www.maxim-ic.com/DallasPackInfo. PACKAGE TYPE 8 DIP (300 mils (150 mils) 8 ...

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