2.3 V memory module temperature sensor
Features
■ STTS3000 is a 2.3 V memory module
temperature sensor forward compatible with
JEDEC standard TS3000 and backward
compatible with STTS424
■ Operating temperature range:
– –40 °C to +125 °C
■ Single supply voltage: 2.3 V to 3.6 V
■ Temperature sensor resolution:
programmable (9-12 bits)
0.25 °C (typ)/LSB - (10-bit) default
■ Temperature sensor accuracy (max):
– ± 1 °C from +75 °C to +95 °C
– ± 2 °C from +40 °C to +125 °C
– ± 3 °C from –40 °C to +125 °C
■ ADC conversion time: 125 ms (max) at default
resolution (10-bit)
■ Typical operating supply current: 160 µA
■ Temperature hysteresis selectable set points
from: 0, 1.5, 3, 6.0 °C
■ Two-wire SMBus/I
interface
■ Supports up to 400 kHz transfer rate
■ Does not initiate clock stretching
■ Supports SMBus timeout 25 ms - 35 ms
■ Spike suppression filters on the two-wire bus
inputs
■ Voltage hysteresis per I
wire bus inputs
2
C - compatible serial
2
C specs on the two-
STTS3000
Data brief
TDFN8 (DN)
2 mm x 3 mm (max height 0.80 mm)
■ 2 mm x 3 mm TDFN8, height: 0.80 mm (max)
RoHS compliant, halogen-free
■
(a)
(a)
a. Compliant to JEDEC MO-229, WCED-3
April 2010 Doc ID 17407 Rev 1 1/8
For further information contact your local STMicroelectronics sales office.
www.st.com
1
Description STTS3000
1 Description
The STTS3000 is targeted for DIMM modules in mobile personal computing platforms
(laptops), servers and other industrial applications. The thermal sensor (TS) in the
STTS3000 is compliant with the JEDEC specification TS3000 which defines memory
module thermal sensors requirements for mobile platforms.
The TS provides space as well as cost savings for mobile and server platform dual inline
memory modules (DIMM) manufacturers, as it is packaged in the compact 2 mm x 3 mm
8-lead TDFN package with a thinner maximum height of 0.80 mm. The DN package is
compliant to JEDEC MO-229, variation WCED-3.
The digital temperature sensor has a programmable 9-12 bit analog-to-digital converter
(ADC) which monitors and digitizes the temperature to a resolution of up to 0.0625 °C. The
default resolution is 0.25 °C/LSB (10-bit). The typical accuracies over these temperature
ranges are:
● ±2 °C over the full temperature measurement range of –40 °C to 125 °C
● ±1 °C in the +40 °C to +125 °C active temperature range, and
● ±0.5 °C in the +75 °C to +95 °C monitor temperature range
The temperature sensor in the STTS3000 is specified for operating at supply voltages from
2.3 V to 3.6 V. Operating at 3.3 V, the typical supply current is 160 µA (includes SMBus
communication current).
The on-board sigma delta ADC converts the measured temperature to a digital value that is
calibrated in °C. For Fahrenheit applications, a lookup table or conversion routine is
required. The STTS3000 is factory-calibrated and requires no external components to
measure temperature.
The digital temperature sensor has user-programmable registers that provide the
capabilities for DIMM temperature-sensing applications. The open drain event output pin is
active when the monitoring temperature exceeds a programmable limit, or it falls above or
below an alarm window. The user has the option to set the event output as a critical
temperature output. This pin can be configured to operate in either a comparator mode for
thermostat operation or in interrupt mode.
2/8 Doc ID 17407 Rev 1
STTS3000 Description
Figure 1. Logic diagram
V
DD
SDA
(1)
EVENT
(1)
SCL
STTS3000
V
SS
1. SDA and EVENT are open drain.
Table 1. Signal names
A
A
A
2
1
0
Pin Symbol Description Type
1 A0 Serial bus address selection pin. Can be tied to V
2 A1 Serial bus address selection pin. Can be tied to V
3 A2 Serial bus address selection pin. Can be tied to V
4V
SS
5SDA
Supply ground
(1)
Serial data Input/output
or VDD. Input
SS
or VDD. Input
SS
or VDD. Input
SS
6 SCL Serial clock Input
DD
(1)
Event output pin. Open drain and active-low. Output
Supply power (2.3 V to 3.6 V)
7 EVENT
8V
1. SDA and EVENT are open drain.
AI12261
Figure 2. TDFN8 connections (top view)
A0
A1
A2
GND
1. SDA and EVENT are open drain.
Doc ID 17407 Rev 1 3/8
1
2
3
4
V
8
7
6
5
DD
EVENT
SCL
(1)
SDA
(1)
AI12262
Description STTS3000
Figure 3. Block diagram
8
V
DD
Temperature
Sensor
EVENT
7
ADC
Capability
Register
Configuration
Register
Temperature
Register
Logic Control
Comparator
Timing
Upper
Register
Lower
Register
Critical
Register
Address Pointer
Register
A0
1
A1
2
A2
3
SMBus/I2C
Interface
V
SS
4
Manufacturer
ID
Device ID/
Revision
SCL
SDA
6
5
AI12278b
4/8 Doc ID 17407 Rev 1
STTS3000 Temperature sensor registers
2 Temperature sensor registers
The temperature sensor component is comprised of various user-programmable registers.
These registers are required to write their corresponding addresses to the pointer register.
They can be accessed by writing to their respective addresses (see Table 2). Pointer
register bits 7 - 4 must always be written to '0'. This must be maintained, as not setting these
bits to '0' may keep the device from performing to specifications.
The main registers include:
● Capability register (read-only)
● Configuration register (read/write)
● Temperature register (read-only)
● Alarm temperature trip registers (read/write), including
– Alarm temperature upper boundary,
– Alarm temperature lower boundary, and
– Critical temperature.
● Manufacturer’s ID register (read-only)
● Device ID and device revision ID register (read-only)
● Temperature resolution register (TRES) (read/write)
Table 2. Temperature sensor registers summary
Address (hex) Register name Power-on default
Not applicable Address pointer Undefined
00 Capability B-grade only 0x006F
01 Configuration 0x0000
02 Alarm temperature upper boundary trip 0x0000
03 Alarm temperature lower boundary trip 0x0000
04 Critical temperature trip 0x0000
05 Temperature Undefined
06 Manufacturer’s ID 0x104A
07 Device ID/revision 0x0200
08 Temperature resolution register 0x01
Note: Registers beyond the specified (00-08) are reserved for STMicroelectronics internal use
only, for device test modes in product manufacturing. The registers must NOT be accessed
by the user (customer) in the system application or the device may not perform according to
specifications.
Doc ID 17407 Rev 1 5/8
Part numbering STTS3000
3 Part numbering
Table 3. Ordering information scheme
Example: STTS3000 B 2 DN 3 F
Device type
STTS3000
Accuracy grade
B: Maximum accuracy 75 °C to 95 °C = ± 1 °C
Voltage (minimum)
2 = 2.3 V - 3.6 V part
Package
DN = TDFN8 (0.80 mm max height)
Tem peratur e
3 = –40 °C to 125 °C
Shipping method
®
F = ECOPACK
E = ECOPACK
package, tape & reel packing
®
package, tube packing
For other options, or for more information on any aspect of this device, please contact the
ST sales office nearest you.
6/8 Doc ID 17407 Rev 1
STTS3000 Revision history
4 Revision history
Table 4. Document revision history
Date Revision Changes
19-Apr-2010 1 Initial release.
Doc ID 17407 Rev 1 7/8
STTS3000
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8/8 Doc ID 17407 Rev 1
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