Pin Function Grouping

adrian95

adrian95

Looking at the datasheet of this component, can you group together pins by their functions? for example for Power, VDD, gnd_1 gnd_2 etc NOTE: If you group them, can you not add the same pin if you already added them in a group? You should know which pin function is common for its function

flux

I grouped the ADXL345 pins into unique functional groups with no duplicated pins: Power, Ground, Communication/Serial Interface, Interrupt Outputs, Reserved, and No Connect. Full table is in the ADXL345BCCZ-RL Pin Function Groups project file.
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ADXL345BCCZ-RL Pin Function Groups
Source: Analog Devices ADXL345 datasheet, Pin Configuration and Function Descriptions / Table 5. The grouping below assigns each physical pin to exactly one functional group; duplicate/common functions are grouped once and no pin is repeated across groups.

Table

GroupPinsWhy grouped hereSuggested SectionSuggested Pin GroupSuggested Flux Pin Type
PowerPin 1 VDD I/O; Pin 6 VSSupply rails: digital interface supply and main supply voltagePowerPowerPower In
GroundPin 2 GND; Pin 4 GND; Pin 5 GNDAll ground/return pinsGroundGroundGround
Communication / Serial InterfacePin 7 CS; Pin 12 SDO / ALT ADDRESS; Pin 13 SDA / SDI / SDIO; Pin 14 SCL / SCLKSPI/I2C bus and address/control signalsCommunicationSerial_InterfacePin 7 Input; Pin 12 Output/Bi-Directional depending mode; Pin 13 Bi-Directional; Pin 14 Input
Interrupt OutputsPin 8 INT1; Pin 9 INT2Dedicated interrupt output pinsSignalInterruptOutput
ReservedPin 3 RESERVED; Pin 11 RESERVEDDatasheet-reserved pins with required connection/open guidanceNo Connect or Control*ReservedUnspecified*
No ConnectPin 10 NCNot internally connectedNo ConnectNCNot Connected
* For reserved pins, I would keep them in their own Reserved group rather than mixing them with Power/Ground, even though the datasheet gives connection guidance: Pin 3 must be connected to VS or left open, and Pin 11 must be connected to ground or left open. This prevents them from being duplicated in Power or Ground while still preserving their required handling in the pin description.
Full pin list, one group per pin

Table

Pin No.Datasheet mnemonicDatasheet functionAssigned group
1VDD I/ODigital interface supply voltagePower
2GNDMust be connected to groundGround
3RESERVEDMust be connected to VS or left openReserved
4GNDMust be connected to groundGround
5GNDMust be connected to groundGround
6VSSupply voltagePower
7CSChip selectCommunication / Serial Interface
8INT1Interrupt 1 outputInterrupt Outputs
9INT2Interrupt 2 outputInterrupt Outputs
10NCNot internally connectedNo Connect
11RESERVEDMust be connected to ground or left openReserved
12SDO / ALT ADDRESSSerial data output for SPI 4-wire / alternate I2C address selectCommunication / Serial Interface
13SDA / SDI / SDIOI2C serial data / SPI serial data input / SPI 3-wire data I/OCommunication / Serial Interface
14SCL / SCLKSerial communication clock for I2C/SPICommunication / Serial Interface
Notes
  • I did not place Pin 3 in the Power group or Pin 11 in the Ground group, even though their allowed connections reference VS and ground respectively, because their actual function is RESERVED.
  • SDO / ALT ADDRESS, SDA / SDI / SDIO, and SCL / SCLK are common serial-interface functions and belong together.
  • INT1 and INT2 are common interrupt output functions and belong together.
  • If you want this applied to the part terminals, the next step is to update each terminal’s Section, Pin Group, Pin Type, Pin Orientation, and short Pin Description properties from this mapping.

    Recommended groups

    Full pin list, one group per pin

    Notes

Documents

    ADXL345BCCZ-RL Pin Function Groups

Assets

ADXL345BCCZ-RL

ADXL345BCCZ-RL

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ADXL345BCCZ-RL.png

ADXL345BCCZ-RL.png

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ADXL345BCCZ-RL

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Accelerometer X, Y, Z Axis ±2g, 4g, 8g, 16g 0.05Hz ~ 1.6kHz 14-LGA (3x5)
The ADXL345 is a small, thin, ultralow power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface. The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution (3.9 mg/LSB) enables measurement of inclination changes less than 1.0°. Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion by comparing the acceleration on any axis with user-set thresholds. Tap sensing detects single and double taps in any direction. Free-fall sensing detects if the device is falling. These functions can be mapped individually to either of two interrupt output pins. An integrated memory management system with a 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor activity and lower overall system power consumption. Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation. The ADXL345 is supplied in a small, thin, 3 mm × 5 mm × 1 mm, 14-lead, plastic package.
► Ultralow power: as low as 23 µA in measurement mode and 0.1 µA in standby mode at VS = 2.5 V (typical) ► Power consumption scales automatically with bandwidth ► User-selectable resolution ► Fixed 10-bit resolution ► Full resolution, where resolution increases with g range, up to 13-bit resolution at ±16 g (maintaining 4 mg/LSB scale factor in all g ranges) ► Embedded memory management system with FIFO technology minimizes host processor load ► Single tap/double tap detection ► Activity/inactivity monitoring ► Free-fall detection ► Supply voltage range: 2.0 V to 3.6 V ► I/O voltage range: 1.7 V to VS ► SPI (3- and 4-wire) and I2C digital interfaces ► Flexible interrupt modes mappable to either interrupt pin ► Measurement ranges selectable via serial command ► Bandwidth selectable via serial command ► Wide temperature range (−40°C to +85°C) ► 10,000 g shock survival ► Pb free/RoHS compliant
#commonpartslibrary #sensor #transducer #accelerometer

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Analog Devices Inc.

ADXL345BCCZ-RL

analog.com/media/en/technical-documentation/data-sheets/ADXL345.pdf

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