CS5525-ASZ datasheet(10/30 Pages) CIRRUS

10 / 30 page

CS5525 CS5526

DS202F5

System Initialization

When power to the CS5525/26 is applied, they are

held in a reset condition until their 32.768 kHz os-

cillators have started and their start-up counter-tim-

er elapses. Due to the high Q of a 32.768 kHz

crystal, the oscillators take 400-600 ms to start. The

converter’s counter-timer counts no more than

1024 oscillator clock cycles to make sure the oscil-

lator is fully stable. During this time-out period the

serial port logic is reset and the RV (Reset Valid)

bit in the configuration register is set. A reset can be

initiated at any time by writing a logic 1 to the RS

(Reset System) bit in the configuration register.

This automatically sets the RV bit until the RS bit

is written to logic 0, and the configuration register

is read. After a reset, the on-chip registers are ini-

tialized to the following states and the converters

are ready to perform conversions.

Command Operation

The CS5525/26 include a microcontroller with five

registers used to control the converter. Each regis-

ter is 24-bits in length except the 8-bit command

conversion data). After a system initialization or re-

set, the serial port is initialized to the command

mode and the converter stays in this mode until a

valid 8-bit command is received (the first 8-bits

into the serial port). Table 1 lists all the valid com-

mands. Once a valid 8-bit command (a read or a

write command word) is received and interpreted

by the command register, the serial port enters the

data mode. In data mode the next 24 serial clock

pulses shift data either into or out of the serial port

(72 serial clock pulses are needed if set-up register

is selected). See Table 2 for configuring the

CS5525/26.

Figure 5. CS5525/26 Configured for Single Supply Bridge Measurement.

configuration register:

000040(H)

offset register:

000000(H)

gain register:

800000(H)

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