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SUMMIT
MICROELECTRONICS, Inc.
SMD1102 / 1103 / 1113
Preliminary
10-Bit Data Acquisition System for Autonomous Environmental Monitoring
FEATURES
! Complete Data Acquisition System " 10-Bit A/D Converter Resolution " 75µs Acquisition plus Conversion Time " Alarm Limits for Each Input Channel " Auto-Increment of Input Channels " Two Wire I2C Serial Data Interface " System Management Bus (SMBus) Compatible " Auto-Monitor with SMBALERT Output " Low Quiescent Current of 50µA " Wide Supply Voltage Range: 2.7V to 5.5V ! SMD1102 " 2-Channel Analog Input
" External Voltage Reference Input Provided for Absolute Measurements ! SMD1103 " 3-Channel Analog Input " Reference Voltage Input for the A/D Converter is Connected to VDD for Ratiometric Measurements ! SMD1113 " Extended I2C Operation " 3-Channel Analog Input " External Voltage Reference Input Provided for Absolute Measurements
FUNCTIONAL BLOCK DIAGRAM
VDD (1102, 1113) REFIN X (1103, A 2 IN 1113) AIN1 AIN0
X ANALOG MULTIPLEXER SAMPLE AND HOLD
SMBALERT#
CONTROL LOGIC
10-BIT A/D CONVERTER
CONVERTER CLOCK
Note: See Pin Configuration drawings for pinouts
(1113) CE# E2PROM ALARM LIMIT REGISTERS 2-WIRE SERIAL INTERFACE
SCL SDA (1113) A2 (1113) A1 (1113) A0
GND
2033 BD 7.0
©SUMMIT MICROELECTRONICS, Inc., 2001 • 300 Orchard City Dr., Suite 131 • Campbell, CA 95008 • Phone 408-378-6461 • FAX 408-378-6586 • www.summitmicro.com
Characteristics subject to change without notice
2033 8.1 10/04/01
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SMD1102 / 1103 / 1113
INTRODUCTION
The SMD1102, SMD1103 and SMD1113 each contain a 10-Bit data acquisition system (DAS) with dedicated EEPROM alarm limit storage. The three devices communicate with the host µP via a standard two-wire I2C serial interface. After initialization the SMD1102/1103/1113 can automatically monitor one or more analog input channels. If any input signal moves beyond its user-programmed limits the host is notified by the SMBALERT# output, enabling fault prediction in telecom line card applications, as an example.
PIN CONFIGURATION
8-Pin SOIC
PIN NAMES
1102 AIN0, AIN1 Analog channel inputs Power supply return Reference input Serial Clock Serial Data Interrupt output Power Supply
SMD1102 REFIN AIN1 AIN0 GND 1 2 3 4 8 7 6 5 VDD SMBALERT# SCL SDA
2033 8 PCon-2
GND REFIN SCL SDA SMBALERT# VDD
8-Pin SOIC SMD1103 AIN2 AIN1 AIN0 GND 1 2 3 4 8 7 6 5 VDD SMBALERT# SCL SDA
2033 8 PCon-3
1103 AIN0, AIN1, AIN2 GND SCL SDA SMBALERT# VDD Analog channel inputs Power supply return Serial Clock Serial Data Interrupt output Power Supply
1113
14-Pin SOIC SMD1113
CE# A2, A1, A0
Chip Enable I2C Address select inputs Analog channel inputs Power supply return Reference input Serial Clock Serial Data Interrupt output Power Supply
A0 A1 A2 AIN2 AIN1 AIN0 GND
1 2 3 4 5 6 7
14 13 12 11 10 9 8
VDD CE# REFIN NC SMBALERT# SCL SDA
2033 14 PCon
AIN0, AIN1, AIN2 GND REFIN SCL SDA SMBALERT# VDD
2
2033 8.1 10/04/01
SUMMIT MICROELECTRONICS, Inc.
SMD1102 / 1103 / 1113
ABSOLUTE MAXIMUM RATINGS*
Temperature Under Bias ...................... –55°C to 125°C Storage Temperature ........................... –65°C to 150°C Lead Solder Temperature (10 seconds) ............. 300 °C Terminal Voltage with Respect to GND: All ......................................... –2V to 7V *COMMENT
Stresses 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 outside those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
DC OPERATING CHARACTERISTICS
(Over Recommended Operating Conditions; Voltages are relative to GND) Symbol VCC ICC ISB ILI ILO VOL Parameter Supply Voltage Supply Current Standby Current Input leakage current Output leakage current Output low voltage All outputs open All outputs open, ADC idle, no memory write in process VIN = 0V to VCC VOUT = 0V to VCC VCC = 5V, IOL = 2.1mA VCC < 4.5V, IOL = 1mA Output high voltage Input low voltage Input high voltage VREF input voltage Input voltage on AIN0 through AIN2 VCC = 5V, IOL = –400µA VCC < 4.5V, IOL = –100µA 2.4 V VCC – 0.2 –0.1 0.7 × VCC 1 0 0.3 × VCC VCC + 0.7 VCC 5.5 V V V V
2033 Elect Table
Conditions (Note 1)
Min. 2.7
Typ.
Max. 5.5 3
Units V mA µA
50 2 10 0.4
µA µA V
0.2
VOH VIL VIH VREFIN VIN
Analog Inputs
RECOMMENDED OPERATING CONDITIONS Temperature Voltage –40ºC to 85ºC. 2.7V to 5.5V
SUMMIT MICROELECTRONICS, Inc.
2033 8.1 10/04/01
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SMD1102 / 1103 / 1113
PIN DESCRIPTIONS
Serial Clock (SCL) The SCL input is used to clock data into and out of the device. In the WRITE mode data must remain stable while SCL is HIGH. In the READ mode data is clocked out on the falling edge of SCL. Serial Data (SDA) The SDA pin is a bidirectional pin used to transfer data into and out of the device. Data may change only when SCL is LOW, except during.