Honeywell HMC5843 User Manual
3-Axis Digital Compass IC
HMC5843
The Honeywell HMC5843 is a surface mount multi-chip module designed for low field magnetic sensing with a digital interface for applications such as low cost compassing and magnetometry. The HMC5843 includes our state of the art 1043 series magneto-resistive sensors plus Honeywell developed ASIC containing amplification, strap drivers, offset cancellation, 12-bit ADC and an I2C serial bus interface. The HMC5843 is in a 4.0 by 4.0 by 1.3mm surface mount leadless chip carrier (LCC). Applications for the HMC5843 include Consumer Electronics, Auto Navigation Systems, Personal Navigation Devices, and Magnetometers.
The HMC5843 utilizes Honeywell’s Anisotropic Magnetoresistive (AMR) technology that provides advantages over other magnetic sensor technologies. The sensors feature precision in-axis sensitivity and linearity, solid-state construction with very low cross-axis sensitivity designed to measure both direction and magnitude of Earth’s magnetic fields, from tens of micro-gauss to 6 gauss. Honeywell’s Magnetic Sensors are among the most sensitive and reliable low-field sensors in the industry.
Honeywell continues to maintain product excellence and performance by introducing innovative solid-state magnetic sensor solutions. These are highly reliable, top performance products that are delivered when promised. Honeywell’s magnetic sensor solutions provide real solutions you can count on.
FEATURES |
BENEFITS |
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4 3-Axis Magnetoresistive Sensors and |
4 Small Size for Highly Integrated Products. Just Add a Micro- |
ASIC in a Single Package |
Controller Interface, Plus Two External SMT Capacitors |
4 Low Cost |
4 Designed for High Volume, Cost Sensitive OEM Designs |
4 4.0 x 4.0 x 1.3mm Low Height Profile |
4 Easy to Assemble & Compatible with High Speed SMT Assembly |
LCC Surface Mount Package |
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4 Low Voltage Operations (2.5 to 3.3V) |
4 Compatible for Battery Powered Applications |
4 Built-In Strap Drive Circuits |
4 Set/Reset and Offset Strap Drivers for Degaussing, Self Test, and |
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Offset Compensation |
4 I2C Digital Interface |
4 Popular Two-Wire Serial Data Interface for Consumer Electronics |
4 Lead Free Package Construction |
4 Complies with Current Environmental Standards |
4 Wide Magnetic Field Range (+/-6 Oe) |
4 Sensors Can Be Used in Strong Magnetic Field Environments |
4 Available in Tape & Reel Packaging |
4 High Volume OEM Assembly |
HMC5843
SPECIFICATIONS (* Tested at 25°C except stated otherwise.)
Characteristics |
Conditions* |
Min |
Typ |
Max |
Units |
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Power Supply |
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Supply Voltage |
AVDD Referenced to AGND |
2.5 |
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3.3 |
Volts |
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DVDD Referenced to DGND |
1.6 |
1.8 |
2.0 |
Volts |
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Current Draw |
Sleep Mode (dual supplies) |
- |
2.5 |
- |
uA |
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Idle Mode (dual supplies) |
- |
240 |
- |
uA |
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Measurement Mode |
- |
0.8 |
- |
mA |
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AVDD = 2.5 volts, DVDD = 1.8 volts |
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Sleep Mode (single supply) |
- |
110 |
- |
uA |
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Idle Mode (single supply) |
- |
340 |
- |
uA |
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Measurement Mode |
- |
0.9 |
- |
mA |
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AVDD = 2.5 volts |
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Performance |
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Field Range |
Full scale (FS) – total applied field |
-4 |
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+4 |
gauss |
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Cross-Axis Sensitivity |
Cross field = 0.5 gauss, |
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±0.2% |
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%FS/gauss |
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Happlied = ±3 gauss |
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Disturbing Field |
Sensitivity starts to degrade. |
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20 |
gauss |
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Use S/R pulse to restore sensitivity. |
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Max. Exposed Field |
No perming effect on zero reading |
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10000 |
gauss |
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Measurement Period |
Output Rate = 50Hz (10Hz typ.) |
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- |
10 |
msec |
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I2C Address |
7-bit address |
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0x1E |
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hex |
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8-bit read address |
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0x3D |
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hex |
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8-bit write address |
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0x3C |
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hex |
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I2C Rate |
Controlled by I2C Master |
-10 |
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+10 |
% |
I2C bus pull-up |
Internal passive resistors |
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50 |
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kilo-ohms |
I2C Hysteresis |
Hysteresis of Schmitt trigger inputs on SCL |
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and SDA - Fall (DVDD=1.8V) |
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0.603 |
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Volts |
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Rise (DVDD=1.8V) |
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1.108 |
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Volts |
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Self Test |
Positive and Negative Bias Mode |
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±0.55 |
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gauss |
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Mag Dynamic Range |
3-bit gain control |
±0.7 |
±1.0 |
±4.0 |
gauss |
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Linearity |
Full scale input range |
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0.1 |
±% FS |
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Gain Tolerance |
All gain/dynamic range settings |
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±5 |
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% |
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Bandwidth |
-3dB point |
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10 |
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kHz |
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Resolution |
AVDD=3.0V, GN |
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7 |
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milli-gauss |
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Signal-to Noise Ratio |
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70 |
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dB |
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Turn-on Time |
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200 |
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us |
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General |
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ESD Voltage |
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700 |
V |
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Operating Temperature |
Ambient |
-30 |
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85 |
°C |
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Storage Temperature |
Ambient, unbiased |
-40 |
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125 |
°C |
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Weight |
Nominal |
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50 |
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milli-grams |
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2 |
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www.honeywell.com |
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HMC5843
PIN CONFIGURATIONS
(Arrow indicates direction of applied field that generates a positive output voltage after a SET pulse.)
Pin |
Name |
Description |
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1 |
SCL |
Serial Clock – I2C Master/Slave Clock |
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2 |
SDAP |
Serial Data Pull-up Resistor – 50k-ohm to VDD |
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3 |
SCLP |
Serial Clock Pull-up Resistor – 50k-ohm to VDD |
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4 |
NC |
No Connection |
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5 |
NC |
No Connection |
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6 |
OFFP |
Offset Strap Positive |
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7 |
OFFN |
Offset Strap Negative |
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8 |
NC |
No Connection |
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9 |
SETP |
Set/Reset Strap Positive – S/R Capacitor (C2) Connection |
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10 |
SETN |
Set/Reset Strap Negative – Test Point |
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11 |
SVDD |
Sensor Supply – Test Point |
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12 |
DGND |
Digital Supply Ground/Return |
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13 |
C1 |
Reservoir Capacitor (C1) Connection |
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14 |
SETC |
S/R Capacitor (C2) Connection – Driver Side |
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15 |
DVDD |
Digital Positive Supply |
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16 |
VREN |
Voltage Regulator Enable, (GND = Dual Supply, AVDD = Single Supply) |
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17 |
AGND |
Analog Supply Ground/Return |
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18 |
AVDD |
Analog Positive Supply |
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19 |
DRDY |
Data Ready – Test Point |
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20 |
SDA |
Serial Data – I2C Master/Slave Data |
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Table 1: Pin Configurations |
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SCL |
SDAP |
SCLP |
TP1 |
TP0 |
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1 |
2 |
3 |
4 |
5 |
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SDA 20 |
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6 |
OFFP |
DRDY 19 |
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7 |
OFFN |
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Z |
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AVDD 18 |
Y |
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8 |
NC |
AGND 17 |
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9 |
SETP |
VREN 16 |
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X |
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10 |
SETN |
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15 |
14 |
13 |
12 |
11 |
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DVDD |
SETC |
C1 |
DGND |
SVDD |
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HMC5843 – bottom view
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3 |
HMC5843
PACKAGE OUTLINES
PACKAGE DRAWING HMC5843 (20-PIN LPCC, dimensions in millimeters)
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D2 |
A |
Pin 1 |
D3 |
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E2 |
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E |
L |
e |
D
HMC5843 – bottom view
MOUNTING CONSIDERATIONS
Sym |
Min |
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Nom |
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Max |
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A |
1.20 |
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- |
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1.46 |
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D |
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4.0 BSC |
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D2 |
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2.25 |
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D3 |
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0.25 x 20 pins |
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E |
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4.0 BSC |
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E2 |
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2.25 |
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e |
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0.50 Basic |
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L |
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0.40 x 20 pins |
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The following is the recommend printed circuit board (PCB) footprint for the HMC5843.
PCB Pad Definition and Traces
The HMC5843 is a fine pitch LCC package with a 0.50mm pin pitch (spacing), with the pin pads defined as 0.40mm by 0.25mm in size. PCB pads are recommended to be oversized by 0.025mm from each pad for a short dimension oversize of 0.05mm. The interior PCB pad is recommended to be 0.05mm oversized per pin with an exterior oversize of 0.20mm for proper package centering and to permit test probing. Size the traces between the HMC5843 and the external capacitors (C1 and C2) to handle the 1 ampere peak current pulses with low voltage drop on the traces.
Stencil Design and Solder Paste
A 4 mil stencil and 100% paste coverage is recommended for the electrical contact pads.
Pick and Place
Placement is machine dependant and no restrictions are recommended, and have been tested with mechanical centering. Placement force should be equivalent 1206 SMT resistors and enough force should be used to squeeze the paste out from the package/contact pad overlap and to keep the package pin contacts vertical.
Reflow and Rework
No special profile is required for the HMC5843 and compatible with lead eutectic and lead-free solder paste reflow profiles. Honeywell recommends the adherence to solder paste manufacturer’s guidelines. The HMC5843 may be reworked with soldering irons, but extreme care must be taken not to overheat the copper pads from the part’s fiberglass substrate. Irons with a tip temperature no greater than 315°C should be used. Excessive rework risks the copper pads pulling away into the molten solder.
4 |
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HMC5843
INTERNAL SCHEMATIC DIAGRAM
HMC5843
DUAL SUPPLY REFERENCE DESIGN
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5 |
HMC5843
SINGLE SUPPLY REFERENCE DESIGN
BASIC DEVICE OPERATION
Anisotropic Magneto-Resistive Sensors
The Honeywell HMC5843 magnetoresistive sensor circuit is a trio of sensors and application specific support circuits to measure magnetic fields. With power supply applied, the sensor converts any incident magnetic field in the sensitive axis directions to a differential voltage output. The magnetoresistive sensors are made of a nickel-iron (Permalloy) thin-film and patterned as a resistive strip element. In the presence of a magnetic field, a change in the bridge resistive elements causes a corresponding change in voltage across the bridge outputs.
These resistive elements are aligned together to have a common sensitive axis (indicated by arrows on the pinouts) that will provide positive voltage change with magnetic fields increasing in the sensitive direction. Because the output only is in proportion to the one-dimensional axis (the principle of anisotropy) and its magnitude, additional sensor bridges placed at orthogonal directions permit accurate measurement of arbitrary field direction.
Self Test
An offset strap is designed for self test function. The offset strap measures nominally 13 ohms, and requires 10mA for each gauss of induced field. The straps will easily handle currents to buck or boost fields through the ±4 gauss linear measurement range, but designers should note the extreme thermal heating on the sensor die when doing so.
6 |
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HMC5843
Power Management
This device is capable of operating with a single supply (AVDD) or dual supplies (AVDD and DVDD). Pin VREN makes this selection by enabling the internal digital supply voltage regulator. When VREN is tied to AVDD, the device is in single supply operation; this device is powered from AVDD; and the internal voltage regulator is enabled. When VREN is tied to AGND this devices operates with both AVDD and DVDD as supplies. The table below shows the modes available at the various power supply conditions.
DVDD |
AVDD |
Pin |
Modes |
Description |
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VREN |
Supported |
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High |
High |
AGND |
All, except |
Internal voltage regulator: Disabled. |
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Off |
Digital I/O pins: Range from DGND to DVDD. |
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Device fully functional. Digital logic blocks are |
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powered from DVDD supply, including all on- |
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board clocks. |
High |
Low |
AGND |
Idle |
Internal voltage regulator: Disabled. |
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Digital I/O pins: Range from DGND to DVDD. |
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Device Measurement functionality not supported. |
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Device I2 C bus and register access supported. |
Internally |
High |
AVDD |
All, except |
Internal voltage regulator: Enabled |
regulated |
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Off |
Digital I/O pins: Range from AGND to AVDD |
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Device fully functional. Digital logic blocks are |
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powered through on-board regulator. |
Low |
Low |
-- |
Off |
Device in off mode. |
Table 2: Operational Modes and Supply States
Note the continuous current draw versus data update rate in micro-amperes shown in the graph below. Under 10Hz, the current stays below 1mA.
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7 |
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