LTC2600IGNPBF datasheet(13/20 Pages) LINER

13 / 20 page

LTC2600/LTC2610/LTC2620

2600fe

OPERATION

32-bit sequence. The 32-bit word is required for daisy-

chain operation, and is also available to accommodate

microprocessors which have a minimum word width of

16 bits (2 bytes).

Daisychain Operation

The serial output of the shift register appears at the SDO

pin. Data transferred to the device from the SDI input is

delayed 32 SCK rising edges before being output at the

next SCK falling edge.

The SDO output can be used to facilitate control of multiple

serial devices from a single 3-wire serial port (i.e., SCK,

SDI and CS/LD). Such a “daisychain” series is conﬁgured

by connecting SDO of each upstream device to SDI of the

next device in the chain. The shift registers of the devices

are thus connected in series, effectively forming a single

input shift register which extends through the entire

chain. Because of this, the devices can be addressed and

controlled individually by simply concatenating their input

words; the ﬁrst instruction addresses the last device in

the chain and so forth. The SCK and CS/LD signals are

common to all devices in the series.

In use, CS/LD is ﬁrst taken low. Then the concatenated

input data is transferred to the chain, using SDI of the

ﬁrst device as the data input. When the data transfer is

complete, CS/LD is taken high, completing the instruction

sequence for all devices simultaneously. A single device

can be controlled by using the no-operation command

(1111) for the other devices in the chain.

COMMAND

ADDRESS

DATA (16 BITS)

D13

D14

D15

D12 D11 D10 D9

D7 D6

D1 D0

2600 TBL01

MSB

LSB

COMMAND

ADDRESS

DATA (14 BITS + 2 DON’T-CARE BITS)

D13 D12 D11 D10 D9

D7 D6

D1 D0

2600 TBL02

MSB

LSB

COMMAND

ADDRESS

DATA (12 BITS + 4 DON’T-CARE BITS)

D11 D10 D9

D7 D6

D1 D0

2600 TBL03

MSB

LSB

INPUT WORD (LTC2600)

INPUT WORD (LTC2610)

INPUT WORD (LTC2620)

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