CS5531-AS datasheet(29/52 Pages) CIRRUS

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CS5531/32/33/34

DS289PP5

Filter Rate Select, FRS[19]

Use the default output word rates.

Scale all output word rates and their corresponding filter characteristics by a factor of 5/6.

NU (Not Used)[18:0]

Must always be logic 0. Reserved for future upgrades.

2.4. Setting up the CSRs for a Measurement

The CS5531/32/33/34 have four Channel-Setup

Registers (CSRs). Each CSR contains two 16-bit

Setups which are programmed by the user to contain

data conversion information such as: 1) which phys-

ical channel will be converted, 2) at what gain will

the channel be converted, 3) at what word rate will

the channel be converted, 4) will the output conver-

sion be unipolar or bipolar, 5) what will be the state

of the output latch during the conversion, 6) will the

converter delay the start of a conversion to allow

time for the output latch to settle before the conver-

sion is begun, and 7) will the open circuit detect cur-

rent source be activated for that Setup. In addition,

when the OGS bit in the Configuration Register is

set, the Setup selects which set of offset and gain

registers to use when performing conversions or cal-

ibrations. Note that a particular physical input chan-

nel can be represented in more than one Setup with

different output rates, gain ranges, etc. (i.e. each

Setup is independently defined). Refer to section

2.4.1 for more details about the Channel Setup

Registers.

Each 32-bit CSR is individually accessible and

contains two 16-bit Setups. As an example, to con-

figure Setup 1 in the CS5531/32/33/34 with the

write individual channel-setup register command

(0x05 hexadecimal), bits 31 to 16 of CSR 1 con-

tains the information for Setup 1 and bits 15 to 0

contain the information for Setup 2. Note that while

reading/writing CSRs, two Setups are accessed in

pairs as a single 32-bit CSR register. Even if one of

the Setups isn’t used, it must be written to or read.

Examples detailing the power of the CSRs are pro-

vided in section 2.6.3.

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