SNVSBF4
November 2019
LDC1001-Q1
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Typical Application — Axial Distance Sensing
4
Revision History
5
Pin Configuration and Functions
Pin Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Inductive Sensing
7.3.2
Measuring Parallel Resonance Impedance and Inductance With LDC1001-Q1
7.3.2.1
Measuring Inductance
7.3.2.1.1
Example
7.4
Device Functional Modes
7.4.1
INTB Pin Modes
7.4.1.1
Comparator Mode
7.4.1.2
Wake-Up Mode
7.4.1.3
DRDYB Mode
7.5
Programming
7.5.1
Digital Interface
7.5.1.1
SPI Description
7.5.1.2
Extended SPI Transactions
7.6
Register Map
7.6.1
Register Description
7.6.1.1
Revision ID (offset = 0x00) [reset = 0x80]
Table 2.
Revision ID Field Descriptions
7.6.1.2
Rp_MAX (offset = 0x01) [reset = 0x0E]
Table 3.
Rp_MAX Field Descriptions
7.6.1.3
Rp_MIN (offset = 0x02) [reset = 0x14]
Table 4.
Rp_MIN Field Descriptions
7.6.1.4
Sensor Frequency (offset = 0x03) [reset = 0x45]
Table 5.
Sensor Frequency Field Descriptions
7.6.1.5
LDC Configuration (offset = 0x04) [reset = 0x1B]
Table 6.
LDC Configuration Field Descriptions
7.6.1.6
Clock Configuration (offset = 0x05) [reset = 0x01]
Table 7.
Clock Configuration Field Descriptions
7.6.1.7
Comparator Threshold High LSB (offset = 0x06) [reset = 0xFF]
Table 8.
Comparator Threshold High LSB Field Descriptions
7.6.1.8
Comparator Threshold High MSB (offset = 0x07) [reset = 0xFF]
Table 9.
Comparator Threshold High MSB Field Descriptions
7.6.1.9
Comparator Threshold Low LSB (offset = 0x08) [reset = 0x00]
Table 10.
Comparator Threshold Low LSB Field Descriptions
7.6.1.10
Comparator Threshold Low MSB (offset = 0x09) [reset = 0x00]
Table 11.
Comparator Threshold Low MSB Field Descriptions
7.6.1.11
INTB Pin Configuration (offset = 0x0A) [reset = 0x00]
Table 12.
INTB Pin Configuration Field Descriptions
7.6.1.12
Power Configuration (offset = 0x0B) [reset = 0x00]
Table 13.
Power Configuration Field Descriptions
7.6.1.13
Status (offset = 0x20) [reset = NA]
Table 14.
Status Field Descriptions
7.6.1.14
Proximity Data LSB (offset = 0x21) [reset = NA]
Table 15.
Proximity Data LSB Field Descriptions
7.6.1.15
Proximity Data MSB (offset = 0x22) [reset = NA]
Table 16.
Proximity Data MSB Field Descriptions
7.6.1.16
Frequency Counter LSB (offset = 0x23) [reset = NA]
Table 17.
Frequency Counter LSB Field Descriptions
7.6.1.17
Frequency Counter Mid-Byte (offset = 0x24) [reset = NA]
Table 18.
Frequency Counter Mid-Byte Field Descriptions
7.6.1.18
Frequency Counter MSB (offset = 0x25) [reset = NA]
Table 19.
Frequency Counter MSB Field Descriptions
8
Application and Implementation
8.1
Application Information
8.1.1
Calculation of Rp_Min and Rp_Max
8.1.1.1
Rp_MAX
8.1.1.2
Rp_MIN
8.1.2
Output Data Rate
8.1.2.1
Example
8.1.3
Selecting a Filter Capacitor (CFA and CFB Pins)
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Sensor and Target
8.2.2.2
Calculating a Sensor Capacitor
8.2.2.3
Selecting a Filter Capacitor
8.2.2.4
Setting Rp_MIN and Rp_MAX
8.2.2.5
Calculating Minimum Sensor Frequency
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Receiving Notification of Documentation Updates
11.2
Support Resources
11.3
Trademarks
11.4
Electrostatic Discharge Caution
11.5
Glossary
12
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
PW|16
MPDS361A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvsbf4_oa
snvsbf4_pm
1
Features
AEC-Q100 Qualified for Automotive Applications:
Temperature grade 0: –40°C to 150°C, T
A
Magnet-free operation
Sub-micron precision
Adjustable sensing range (through coil design)
Lower system cost
Remote sensor placement (decoupling the LDC from harsh environments)
High durability (by virtue of contact-less operation)
Insensitivity to environmental interference (such as dirt, dust, water, oil)
Supply voltage, analog: 4.75 V to 5.25 V
Supply voltage, IO: 1.8 V to 5.25 V
Supply current (without LC tank): 1.7 mA
R
P
resolution: 16-bit
L resolution: 24-bit
LC frequency range: 5 kHz to 5 MHz
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