Features
•
Integrated Temperature Sensor (TS) + 2Kbit Serial EEPROM
•
Jedec (JC42.4) SO-DIMM SPD + TS compliant
•
Standard voltage operation
Optimized for voltage range: 2.7V to 3.6V
•
100khz and 400khz Compatibility
•
Two-wire Serial Interface: I C/SMBus™ compatible
SMBus Timeout supported
•
Schmitt Trigger, filtered inputs for Noise Suppression
•
Industry Standard Green (Pb/Halide-free/RoHS Compliant) Package Options
8-pad Very Very Thin DFN (2 x 3 x 0.8mm)
2
Serial EEPROM Features
•
Permanent and Reversible Software Write Protection for the First-half of the Array
Software Procedure to Verify Write Protect Status
•
Internally organized as one block of 256-bytes (256 x 8)
•
Supports Byte and Page Write operation
Write 1-, 2-, 3-, up to 16-bytes at a time
•
Self-timed Write cycle (5ms max)
•
High-reliability
Endurance: 1 Million Write Cycles
Data Retention: 100 years
•
Low Operating current
EEPROM Write ~1.5mA (typ.)
EEPROM Read ~ 0.2mA (typ.)
Integrated
Temperature
Sensor with Serial
Electrically-erasable
and Programmable
Read-only Memory
Atmel AT30TSE002B
Preliminary
Temperature Sensor Features
•
11-bit ADC Temp-to-Digital Converter with 0.125°C resolution
•
Programmable hysteresis threshold: off, 0°C, 1.5°C, 3°C, 6 °C
•
B-grade Accuracy
±1°C (max.) for +75°C to +95°C
±2°C (max.) for +40°C to +125°C
±3°C (max.) for -20°C to +125°C
•
Low Operating current
Temperature Sensor Active ~ 0.2mA (typ.)
8711D–SEEPR–8/10
Table 0-1.
Pin Name
A0, A1, A2
SDA
SCL
Pin Configuration
Description
Address Inputs
Serial Data
Serial Clock Input
EVENT
V
CC
EVENT
SCL
SDA
8-WDFN
8
7
6
5
1
2
3
4
A0
A1
A2
GND
Temperature Alert
GND
V
CC
Ground
Power Supply
Bottom View
Description
Atmel
®
AT30TSE002B is a combination serial EEPROM and temperature sensor device containing 2048-bits of
serially electrically-erasable and programmable read only memory (EEPROM) organized as 256-bytes of 8-bits
each and could be used to store memory module and vendor information. The EEPROM operation is tailored
specifically for DRAM Memory Modules Serial Presence Detect (SPD). The first 128-bytes of the memory
incorporate a permanent and a reversible software write protection (WP) feature. Once the permanent software
WP is enabled, by sending a special command, it cannot be reversed. However, once the reversible software WP
is enabled, it can be reversed by sending a special command.
The integrated temperature sensor converts temperatures from -20°C to +125°C to a digital word and provides an
accuracy of ±1°C (max.) in the temperature range +75°C to +95°C. The temperature sensor continuously
monitors temperature and updates data in the temperature register at least eight times per second. Temperature
data is latched internally by the device and may be read by software via a microcontroller at anytime. The
AT30TSE002B has flexible user programmable internal registers to configure the temperature sensor
performance and response to over temperature conditions. The device contains programmable high, low, and
critical temperature limits. The device
EVENT
pin is configured as active low and can be configured to operate as
an interrupt or as a comparator output. Manufacturer and Device ID registers provide the ability to confirm the
identity of the device. The AT30TSE002B supports the industry standard 2-wire I
2
C/ SMBus serial Interface to
include time out feature to help prevent system lock-ups.
2
Atmel AT30TSE002B [Preliminary]
8711D−SEEPR−8/10
Temperature Sensor with Serial EEPROM
1.
Absolute Maximum Ratings
Operating Temperature ................ - 40°C to +125°C
Storage Temperature ................. - 65°C to + 150°C
Voltage on Any Pin
with Respect to Ground ......................- 1.0 V +5.0V
Pin A0 ..................................................- 1.0 V +12V
Maximum Operating Voltage............................ 4.3V
DC Output Current ........................................ 5.0mA
*NOTICE: Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent damage
to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification are not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
Figure 1-1.
Block Diagram
Serial EEPROM
Temperature Sensor
H.V. Pump/Timing
Selected Resolution
Temp. Range
Capability
Accuracy
Output Features
EVENT Shutdown
SMBus
EEPROM Write
Protected Section
(00h-7Fh)
X Address
Decoder
Configuration
Critical Alarm Trip
EEPROM
Second half
(80h-FFh)
Device ID
Manufacturer ID
Temperature
Upper Alarm Trip
A/D
Converter
Y Address Decoder
Memory
Control Logic
Write Protect Circuitry
Lower Alarm Trip
SMBus Timeout
Band Gap
Temperature
Sensor
Pointer
Register
Serial
Control Logic
I2C / SMBus
Interface
Vcc
GND
SCLK
SDA
EVENT
A0
A1
A2
3
8711D–SEEPR–8/10
2.
Pin Description
Atmel
®
AT30TSE002B requires no external components for operation except for pull-up resistors on SCL, SDA,
and
EVENT
pins. In order to provide effective noise protection and filtering, it is recommended that a decoupling
capacitor of 0.1µF be used and is located as close as possible to the device between V
CC
and ground pins.
SERIAL CLOCK (SCL):
The SCL input is used to positive edge clock data into each EEPROM device and
negative edge clock data out of each device.
SERIAL DATA (SDA):
The SDA pin is bidirectional for serial data transfer. This pin is open drain driven and may
be wire-ORed with any number of other open-drain or open collector devices.
Device Addresses (A2, A1, A0):
The A2, A1, and A0 pins are device address inputs that are hardwired (directly
to GND or to V
CC
) for compatibility with two-wire devices. When the pins are hardwired, as many as eight devices
may be addressed on a single bus system. A device is selected when a corresponding hardware and software
match is true. If these pins are left floating, the A2, A1, and A0 pins will be internally pulled to GND. However,
Atmel recommends always connecting the address pins to a known state by direct connection to ground or V
CC
but if using a pull-up resistor, Atmel recommends using 10k ohm or less.
The A0 pin is also overvoltage tolerant, allowing up to 10V for software write protection functionality. (See
Section 4 through Section 7)
Temperature Alert Output
(
EVENT
):
The
EVENT
pin outputs a signal when the temperature goes beyond the user-
programmed temperature limits and be configured in one of three modes; either Interrupt, comparator or critical
alarm modes.
The
EVENT
pin is an open-drain output and requires a pull-up resistor for proper operation (see Section 8).
Pin Capacitance
(1)
Table 2-1.
Applicable over recommended operating range from T
A
= 25°C, f = 100 kHz, V
CC
= +3.0V
Symbol
C
I/O
C
IN
Note:
Test Condition
Input/Output Capacitance (SDA),
EVENT
Input Capacitance (A0, A1, A2, SCL)
1. This parameter is ensured by characterization only
Max
8
6
Units
pF
pF
Conditions
V
I/O
= 0V
V
IN
= 0V
4
Atmel AT30TSE002B [Preliminary]
8711D−SEEPR−8/10
Temperature Sensor with Serial EEPROM
Table 2-2. DC Characteristics
Applicable over recommended operating range:
T
AI
= –20°C to +125°C, V
CC
= +2.7v to +3.6V (unless otherwise noted)
Symbol Parameter
V
CC1
Supply Voltage
Test Condition
Min
2.7
Typ
Max
3.6
Units
V
Supply Current
I
CC
I
CC
I
CC
I
CC
I
SB
I
LI
I
LO
V
IL
V
IH
V
OL
V
HV
V
HYST
T
CONV
T
RES
EEPROM READ V
CC
= 3.6V
(2)
EEPROM WRITE V
CC
= 3.6V
(2)
Temp. Sensor V
CC
= 3.6V
Timeout active V
CC
= 3.6V
Standby Current V
CC
=3.6V
(3)
Input Leakage Current
Output Leakage Current
Input Low Level
(1)
Input High Level
(1)
Output Low level V
CC
= 3.0V
High Voltage Input A0
Input Hysteresis (SDA, SCL)
Temp. Sensor Conversion Time
Temp. Sensor Resolution
I
OL
= 2.1mA
Pin = A0;
V
HV
- V
CC
≥
4.8V
7
0.05 x
V
CC
75
0.25
125
100kHz
100kHz
EEPROM inactive
EEPROM inactive, Temp.
Sensor shutdown
V
in
= V
HV
= or V
SS
V
in
= V
HV
= or V
SS
V
in
= V
HV
= or V
SS
-0.6
V
HV
x0.7
0.4
1.5
0.2
0.2
1.6
0.1
0.1
1.0
3.0
0.5
0.5
4.0
2.0
2.0
V
HV
x 0.3
V
HV
+ 0.5
0.4
10
mA
mA
mA
mA
uA
uA
uA
V
V
V
V
V
mS
°C
Temperature Sensor Accuracy
T
ACCUR
T
ACCUR
T
ACCUR
T
CONV
T
RES
Note:
+75°C < Ta < +95°C
+40°C < Ta < +125°C
-20°C < Ta < +125°C
Temp. Sensor Conversion Time
Temp. Sensor Resolution
1. V
IL
min and V
IH
max are reference only and are not tested
2. Sensor in Shutdown Mode
3. EEPROM inactive, sensor in shutdown mode
-1.0
-2.0
-3.0
±0.5
±1
±2
75
0.25
+1.0
+2.0
+3.0
125
°C
°C
°C
mS
°C
5
8711D–SEEPR–8/10
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