HMC5843 Datasheet, PDF(10/19 Page) Honeywell Solid State Electronics Center

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HMC5843 Datasheet, PDF (10/19 Pages) Honeywell Solid State Electronics Center – 3-Axis Digital Compass IC

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HMC5843

REGISTERS

This device is controlled and configured via a number of on-chip registers, which are described in this section. In the

following descriptions, set implies a logic 1, and reset or clear implies a logic 0, unless stated otherwise.

The table below lists the registers and their access. All address locations are 8 bits.

Address Location

Name

Configuration Register A

Configuration Register B

Mode Register

Data Output X MSB Register

Data Output X LSB Register

Data Output Y MSB Register

Data Output Y LSB Register

Data Output Z MSB Register

Data Output Z LSB Register

Status Register

Identification Register A

Identification Register B

Identification Register C

Access

Read/Write

Read

Table 5: Register List

This section describes the process of reading from and writing to this device. The devices uses an address pointer to

indicate which register location is to be read from or written to. These pointer locations are sent from the master to this

slave device and succeed the 7-bit address plus 1 bit read/write identifier.

To minimize the communication between the master and this device, the address pointer updated automatically without

master intervention. This automatic address pointer update has two additional features. First when address 12 or higher

is accessed the pointer updates to address 00 and secondly when address 09 is reached, the pointer rolls back to

address 03. Logically, the address pointer operation functions as shown below.

If (address pointer = 09) then address pointer = 03

Else if (address pointer >= 12) then address pointer = 0

Else (address pointer) = (address pointer) + 1

The address pointer value itself cannot be read via the I2C bus.

Any attempt to read an invalid address location returns 0âs, and any write to an invalid address location or an undefined bit

within a valid address location is ignored by this device.

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