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Data Sheet

ADXL314

SERIAL COMMUNICATIONS

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Rev. A | 17 of 27

I2C

With CS tied high to VDD I/O, the ADXL314 is in I2C mode, requiring

a simple 2-wire connection as shown in Figure 26. The ADXL314

conforms to the UM10204 I2C-Bus Specification and User Manual,

Rev. 03—19 June 2007, available from NXP Semiconductor. It

supports standard (100 kHz) and fast (400 kHz) data transfer

modes if the bus parameters given in Table 14 and Table 15 are

met. Single-byte or multiple-byte reads and writes are supported,

as shown in Figure 27. With the ALT ADDRESS pin high, the 7-bit

I2C address for the device is 0x1D, followed by the R/W bit, which

translates to 0x3A for a write and 0x3B for a read. An alternate

I2C address of 0x53 (followed by the R/W bit) can be chosen by

grounding the ALT ADDRESS pin (Pin 23), which translates to

0xA6 for a write and 0xA7 for a read.

Figure 26. I2C Connection Diagram (Address 0x53)

If other devices are connected to the same I2C bus, the nominal op-

erating voltage level of these other devices cannot exceed VDD I/O

by more than 0.3 V. External pull-up resistors, RP, are necessary for

proper I2C operation. Refer to the UM10204 I2C-Bus Specification

and User Manual, Rev. 03—19 June 2007, when selecting pull-up

resistor values to ensure proper operation.

Table 14. I2C Digital Input and Output

Parameter

Test Conditions

Limit1

Unit

Min

Max

Digital Input

Low Level Input Voltage (VIL)

0.3 × VDD I/O

High Level Input Voltage (VIH)

0.7 × VDD I/O

Low Level Input Current (IIL)

VIN = VDD I/O

0.1

µA

High Level Input Current (IIH)

VIN = 0 V

−0.1

µA

Digital Output

Low Level Output Voltage (VOL)

VDD I/O < 2 V, IOL = 3 mA

0.2 × VDD I/O

VDD I/O ≥ 2 V, IOL = 3 mA

400

Low Level Output Current (IOL)

VOL = VOL, max

Pin Capacitance

fIN = 1 MHz, VIN = 2.5 V

1 Limits based on characterization results; not production tested.

Figure 27. I2C Device Addressing

Table 15. I2C Timing (TA = 25°C, VS = VDD I/O = 3.3 V)

Parameter

Limit1, 2

Unit

Description

Min

Max

fSCL

400

kHz

SCL clock frequency

2.5

µs

SCL cycle time

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