LTC4261IGN-2 datasheet(21/32 Pages) LINER

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LTC4261/LTC4261-2

42612fb

Ejector Switch or Loop-Through Connection Sense.

Floating switch contacts or a connection sense loop also

work well with the ON pin, replacing the phototransistor

in Figure 8a. If an insertion debounce delay is desired,

use the EN pin as shown in Figure 8c. Like Figures 8a

and 8b, this circuit works on either side of the backplane

connector.

Short Pin to RTN. Figure 8d uses the UV divider string to

detect board insertion. This method works equally well in

both backplane and board resident applications.

AdvancedTCA Style Control. Figure 2 shows an ATCA

application using EN as the interface to the LTC4261.

of EN and by setting C4 high, bit B4 can generate an alert

to instantly report any changes in the state of EN.

I2C Only Control. To lock out EN and ON, use the con-

ﬁguration shown in Figure 8e and control the GATE pin

with register bit D3. The circuit defaults off at power up.

To default on, connect the ON pin to INTVCC. Either FLTIN

or PGIO can be used as an input to monitor a connection

sense or other control signal. PGIO is conﬁgured as an

input by setting register bits D6 and D7 high; its input

state is stored at location B6. FLTIN is always an input

whose state is available from register bit B7. FLTIN gen-

erates an alert if C7 is set high.

Data Converter

The LTC4261/LTC4261-2 incorporates a 10-bit analog-

to-digital converter (ADC) that continuously monitors

three different voltages at (in the sequence of) SENSE,

ADIN2/OV (SSOP/QFN) and ADIN. The voltage between

the SENSE pin and VEE is monitored with a 64mV full

scale and 62.5µV resolution, and the data is stored in

registers E and F. The ADIN and the ADIN2/OV pins are

monitored with a 2.56V full scale and 2.5mV resolution.

The data for the ADIN2/OV pin is stored in registers G

and H. The data for the ADIN pin is stored in registers I

and J.

The results in registers E, F, G, H, I and J are updated at

a frequency of 7.3Hz. Setting CONTROL register bit D5

invokes a test mode that halts updating of these registers

so that they can be written to and read from for software

testing. By invoking the test mode right before reading

the ADC data registers, the 10-bit data separated in two

registers are synchronized.

The ADIN and ADIN2 pins can be used to monitor input

and output voltages of the Hot Swap controller as shown

in Figures 1 and 2.

INTVCC

LTC4261

(8a) Optoisolator Control

47k

–48V

VEE

INTVCC

LTC4261

(8c) Contact Debounce Delay Upon

Insertion for Use with an Ejector

Switch or Loop-Through Style

Connection Sense

100k

LOOP OR

SWITCH

10nF

–48V

VEE

INTVCC

LTC4261

(8b) Logic Control

–48V

VEE

INTVCC

I2C

42612 F08

LTC4261

(8e) I2C-Only Control

SDAO

SDAI

SCL

DEFAULT

OFF

–48V

VEE

INTVCC

LTC4261

(8d) Short Pin Connection Sense to RTN

UVL

UVH

28.7k

–48V

INPUT

–48V

RTN

VEE

453k

Figure 8. On/Off Control of the LTC4261

APPLICATIONS INFORMATION

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