SS8018TR SSC [Silicon Standard Corp.], SS8018TR Datasheet

no-image

SS8018TR

Manufacturer Part Number
SS8018TR
Description
Manufacturer
SSC [Silicon Standard Corp.]
Datasheet
Rev.2.01 6/06/2003
n
n
n
n
n
n
n
n
n
n
n
n
Desktop and Notebook
Computers
Smart Battery Packs
LAN Servers
Industrial Controllers
ORDERING INFORMATION
FEATURES
APPLICATIONS
Two channels: measures both remote and local
temperatures
No calibration required
SMBus 2-wire serial interface
Programmable under/over-temperature alarms
SMBus alert response supported
Accuracy:
Average supply current during conversion of
320µA (typ)
Supply range of +3V to +5.5V
Small 8-lead SO package
Example: SS8018TR
±1°C (+60°C to +100°C, remote)
±3°C (+60°C to + 100°C, local)
SS8018XX
±1°C Remote and Local Temperature Sensor
à SS8018 shipped in
tape & reel packing
PACKING TYPE
TR: TAPE & REEL
Central Office
Telecom Equipment
Test and Measurement
Multi-Chip Modules
www.SiliconStandard.com
n
with SMBus Serial Interface
The SS8018 is a precise digital thermometer that re-
ports the temperature of both a remote sensor and its
own package. The remote sensor is a diode-connected
transistor - typically a low-cost, easily mounted 2N3904
NPN type that replaces a conventional thermistor or
thermocouple. Remote accuracy is ±1°C with no calibra-
tion needed. The remote channel can also measure the
die temperature of other ICs, such as microprocessors,
that contain an on-chip, diode-connected transistor.
The 2-wire serial interface accepts standard System
Management Bus (SMBus) Write Byte, Read Byte, Send
Byte, and Receive Byte commands to program the
alarm thresholds and to read temperature data. The
data format is 11bits plus sign, with each bit corre-
sponding to 0.125°C, in two’s-complement format.
Measurements can be done automatically and autono-
mously, with the conversion rate programmed by the
user or programmed to operate in a single-shot mode.
The adjustable rate allows the user to control the supply
current drain.
The SS8018 is available in a small 8-pin SOP sur-
face-mount package.
DESCRIPTION
SS8018
1 of 14

Related parts for SS8018TR

SS8018TR Summary of contents

Page 1

... LAN Servers Multi-Chip Modules Industrial Controllers n ORDERING INFORMATION SS8018XX PACKING TYPE TR: TAPE & REEL Example: SS8018TR à SS8018 shipped in tape & reel packing Rev.2.01 6/06/2003 with SMBus Serial Interface n DESCRIPTION The SS8018 is a precise digital thermometer that re- ports the temperature of both a remote sensor and its own package ...

Page 2

ABSOLUTE MAXIMUM RATINGS VCC to GND………….….………………………………………………..……….-0.3V to +6V DXP to GND……….……………………………………………………..……..…-0.3V to VCC + 0.3V DXN to GND………………………………………………….……..……………..-0.3V to +0.8V SMBCLK, SMBDATA, ALERT to GND……………………………………...…-0.3V to +6V SMBDATA, ALERT Current………………………………………………..…….-1mA to +50mA DXN Current………………………………………………..…..………………….±1mA ESD Protection (SMBCLK, SMBDATA, ALERT ...

Page 3

ELECTRICAL CHARACTERISTICS (cont.) (VCC = + 3.3V +85°C, unless otherwise noted.) A PARAMETER SMBus Interface Logic Input High Voltage Logic Input Low Voltage Logic Output Low Sink Current ALERT Output High Leakage Current Logic Input ...

Page 4

BLOCK DIAGRAM DXP DXP + + DXN DXN + + REMOTE TEMPERATURE REMOTE TEMPERATURE 11 11 DATA REGISTER DATA REGISTER HIGH-TEMPETATURE HIGH-TEMPETATURE 11 11 THRESHOLD (REMOTE THRESHOLD (REMOTE LOW-TEMPETATURE LOW-TEMPETATURE THRESHOLD (REMOTE THRESHOLD (REMOTE DIGITAL ...

Page 5

APPLICATIONS INFORMATION The SS8018 is a temperature sensor designed to work in conjunction with an external microcontroller (µC) or other intelligence in thermostatic, process-control or monitoring applications. The µC is typically a power- management or keyboard controller, generating SMBus ...

Page 6

ADC Noise Filtering The ADC is an integrating type with inherently good noise rejection. Micro-power operation places con- straints on high-frequency noise rejection; therefore, careful PC board layout and proper external noise filter- ing are required for high-accuracy remote measure- ...

Page 7

Low-Power Standby Mode Standby mode disables the ADC and reduces the sup- ply-current drain to about 10µA. Enter standby mode by forcing high to the /STOP bit in the configuration RUN byte register. Software standby mode behaves such that all ...

Page 8

Write Byte Format S ADDRESS WR 7 bits Slave Address: equivalent to chip- select line of a 3-wire interface Command Byte: selects which register you are writing to Data byte: data goes into the register set by the command byte ...

Page 9

Slave Address The SS8018 appears to the SMBus as one device hav- ing a common address for both ADC channels. The SS8018 device address is set to 1001100. The SS8018 also responds to the SMBus Alert Re- sponse slave address ...

Page 10

Command Byte Functions The 8-bit command byte register (Table 5) is the master index that points to the various other registers within the SS8018. The register’s POR state is 0000 0000, so that a Receive Byte transmission (a protocol that ...

Page 11

Table 6. Configuration-Byte Bit Assignments BIT NAME POR STATE 7 (MSB) MASK 0 / RUN 6 0 STOP 5-0 RFU 0 Table 7. Status-Byte Bit Assignments BIT NAME 7 (MSB) BUSY A high indicates that the ADC is busy converting. ...

Page 12

POR AND UVLO The SS8018 has a volatile memory. To prevent ambigu- ous power-supply conditions from corrupting the data in memory and causing erratic behavior, a POR voltage de- tector monitors VCC and clears the memory if VCC falls below ...

Page 13

HIGH LOW SMBCLK SMBDATA t t SU:STA HD:STA A = start condition B = MSB of address clocked into slave C = LSB of address clocked into slave D = R/W bit clocked into slave E ...

Page 14

PHYSICAL DIMENSIONS 8 Pin SOP Package ¢ X (4X Note: 1. Package body sizes exclude mold flash and gate burrs 2. Dimension L is measured in gage plane 3. Tolerance 0.10mm unless otherwise specified 4. Controlling dimension ...

Related keywords