LTC4271 datasheet(21/30 Pages) AD

21 / 30 page

Figure 14. LTC9101-3/LTC9103 SC, SD, and PC Waveform

LTC9101-3/LTC9103

Rev. 0

For more information www.analog.com

APPLICATIONS INFORMATION

Code Download

LTC9101-3 firmware is field-upgradeable by downloading

and executing firmware images.

Contact Analog Devices for code download procedures

and firmware images.

Two complete copies of firmware images are maintained

under separate ECC and CRC protection for maximum

data protection.

Bus Addressing and Restrictions

The LTC9101-3’s I2C address base is 0x20. Address 0x20

through 0x30 are restricted for use by the LTC9101-3.

LED Indicators

The LTC9101-3 provides Shift Register Data (SD), Shift

external shift registers that drive the port LED indicators.

Two 8-bit shift registers drive an 8-port application while

four 8-bit shift registers drive a 16-port application. Each

port has two LEDs, typically a green LED for port status

and orange for port faults.

Figure 13 shows the hardware connections for the indi-

cator LED serial driver in a 16-port system.

Figure 14 shows the timing waveform of SD, SC, and PC.

Table 7 shows the data variables A0 through A15, and

what port LED they correspond to.

PORT 1

PORT 2

D Q

3.3V

74LVC3G17

3.3V

VDD

CFG1

CFG2

LTC9101-3

OVR

CFG0

DGND

SUPPLY

OVERLOAD

LED

A28

A29

A30

A31

PORT 15

PORT 16

D Q

3.3V

74HCT594 (4×)

91013 F13

• • •

91013 F14

A30

A31

A30

A1 A0

tPC_CLK

Figure 13. LTC9101-3/LTC9103 Shift Register to LED Connectivity in a 16-Port Application

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