Datasheet AD7416, AD7417, AD7418 (Analog Devices)

10-Bit Digital Temperature Sensor (AD7416) and 4-/1-Channel ADCs Data Sheet AD7416/AD7417/AD7418 FEATURES FUNCTIONAL BLOCK DIAGRAMS 10-bit ADC with 15 μs and 30 μs conversion times BAND GAP 10-BIT Single and 4 single-ended analog input channels TEMPERATURE ANALOG-TO-DIGITAL SENSOR CONVERTER AD7416 On-chip temperature sensor: −40°C to +125°C On-chip track-and-hold TEMPERATURE Overtemperature indicator VALUE REGISTER Automatic power-down at the end of a conversion SETPOINT COMPARATOR TOTI SETPOINT Wide operating supply range: 2.7 V to 5.5 V ADDRESS REGISTER 8 V POINTER DD I2C-compatible serial interface REGISTER THYST SETPOINT Selectable serial bus address allows connection of up to 8 REGISTER FAULT 3 OTI AD7416/AD7417 devices to a single bus CONFIGURATION QUEUE COUNTER AD7416 is a superior replacement for LM75 REGISTER 4 GND A0 7 1 SDA SERIAL BUS A1 6 INTERFACE 2
1 0
APPLICATIONS SCL
0
A2 5
6- 12 01
Data acquisition with ambient temperature monitoring
Figure 1. AD7416
Industrial process control REFIN VDD Automotive 5 14 Battery-charging applications TOTI SETPOINT B A > B 4 OTI Personal computers REGISTER TEMP A SENSOR CHARGE DISTRIBUTION DATA OUT GENERAL DESCRIPTION REF DAC 2.5V
The AD7417 and AD7418 are 10-bit, 4-channel and single-channel
3 A SCL IN1 7 CONTROL
ADCs with an on-chip temperature sensor that can operate from a
CLOCK I2C LOGIC A 8 INTERFACE IN2
single 2.7 V to 5.5 V power supply. The devices contain a 15 μs
SAMPLING 2 MUX SDA A 9 CAPACITOR IN3
successive approximation converter, a 5-channel multiplexer, a
A 10 IN4 AD7417
temperature sensor, a clock oscillator, a track-and-hold, and a
VBALANCE
reference (2.5 V). The AD7416 is a temperature-monitoring only 2
1 16 6 15 13 12 11
00 6- device in an 8-lead package.
NC NC GND CONVST A0 A1 A2
12 1 0 The temperature sensor on the parts can be accessed via multip-
NC = NO CONNECT
lexer Channel 0. When Channel 0 is selected and a conversion Figure 2. AD7417 is initiated, the resulting ADC code at the end of the conversion
V REF DD IN
gives a measurement of the ambient temperature (±1°C at 25°C).
7 6
On-chip registers can be programmed with high and low tempera-
TOTI SETPOINT B A > B 3 OTI REGISTER
ture limits, and an open-drain overtemperature indicator (OTI)
TEMP A SENSOR
output is provided, which becomes active when a programmed
CHARGE DISTRIBUTION DATA OUT
limit is exceeded.
REF DAC 2.5V
A configuration register allows programming of the sense of the
2 A SCL IN 5 MUX CONTROL I2C
OTI output (active high or active low) and its operating mode
CLOCK LOGIC INTERFACE SAMPLING 1 SDA
(comparator or interrupt). A programmable fault queue counter
CAPACITOR
allows the number of out-of-limit measurements that must
AD7418
occur before triggering the OTI output to be set to prevent
VBALANCE
3 spurious triggering of the OTI output in noisy environments.
4 8
00 6-
GND CONVST
12 1 0 Figure 3. AD7418
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS TABLE OF CONTENTS REVISION HISTORY PRODUCT HIGHLIGHTS SPECIFICATIONS AD7417/AD7418 SPECIFICATIONS AD7416 SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER DETAILS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS ON-CHIP REFERENCE TEMPERATURE MEASUREMENT INTERNAL REGISTER STRUCTURE Address Pointer Register Temperature Value Register (Address 0x00) Configuration Register (Address 0x01) THYST Setpoint Register (Address 0x02) TOTI Setpoint Register (Address 0x03) ADC Value Register (Address 0x04) ADC Transfer Function Config2 Register (Address 0x05) SERIAL BUS INTERFACE Serial Bus Address Writing to the AD7416/AD7417/AD7418 Reading Data From the AD7416/AD7417/AD7418 OTI OUTPUT FAULT QUEUE POWER-ON DEFAULTS OPERATING MODES Mode 1 Mode 2 CONVSTB START MODE CONVSTB Pin Mode APPLICATIONS INFORMATION SUPPLY DECOUPLING POWER-ON RESET MOUNTING THE AD7416/AD7417/AD7418 FAN CONTROLLER THERMOSTAT SYSTEM WITH MULTIPLE AD7416 DEVICES OUTLINE DIMENSIONS ORDERING GUIDE