LTC6953 datasheet(25/56 Pages) AD

25 / 56 page

LTC6953

Rev 0

For more information www.analog.com

Preliminary Technical Data

Advance Product Information Subject to Change

Rev PrA

continues sending bytes destined for subsequent regis-

ters. Byte 1’s address is ADDRX + 1, Byte 2’s address

is ADDRX + 2, and so on. If the register address pointer

attempts to increment past 56 (h38), it is automatically

reset to 0.

An example of an auto-increment read from the part is

shown in Figure 17. The first byte of the burst sent from

the serial bus master on SDI contains the destination

read. Once the LTC6953 detects a read burst, it takes SDO

out of the Hi-Z condition and sends data bytes sequen-

tially, beginning with data from register ADDRX. The part

ignores all other data on SDI until the end of the burst.

Multidrop Configuration

Several LTC6953s may share the serial bus. In this mul-

tidrop configuration, SCLK, SDI, and SDO are common

between all parts. The serial bus master must use a sepa-

rate CS for each part and ensure that only one device has

CS asserted at any time. It is recommended to attach a

OPERATION

Figure 16. Serial Port Auto-Increment Write

Figure 17. Serial Port Auto-Increment Read

ADDRX + Wr

Hi-Z

MASTER–CS

MASTER–SDI

LTC6953–SDO

BYTE X

BYTE X + 1

BYTE X + 2

6953 F16

ADDRX + Rd

DON’T CARE

Hi-Z

MASTER–CS

MASTER–SDI

LTC6953–SDO

6953 F17

BYTE X

BYTE X + 1

BYTE X + 2

high value resistor to SDO to ensure the line returns to a

known level during Hi-Z states.

Serial Port Registers

The memory map of the LTC6953 is found in Table 10,

with detailed bit descriptions found in Table 11. The reg-

ister address shown in hexadecimal format under the

“ADDR” column is used to specify each register. Each

(R/W). The register’s default value on device power-up or

after a reset is shown at the right.

The read-only register at address h00 is used to determine

different status flags. These flags may be instantly output

on the STAT pin by configuring register h01. See STAT

Output section for more information.

The register at address h38 is a read-only byte for device

identification.

LTC6953 数据表(PDF) 25 Page - Analog Devices

LTC6953 数据表(HTML) 25 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

数据表下载