LT3074AVPBF datasheet(43/62 Pages) AD

43 / 62 page

Data Sheet

LT3074

analog.com

Rev 0.

43 of 62

Table 10. Recommended Resistor Values for Address Programming Using ASEL pin

RASEL_TOP 1

RASEL_BOT 1

Address Lower Nibble

7-Bit Address

124kΩ

84.5kΩ

4’h0

7’h60 2

124kΩ

95.3kΩ

4’h1

7’h61 3

124kΩ

107kΩ

4’h2

7’h62

105kΩ

102kΩ

4’h3

7’h63

137kΩ

150kΩ

4’h4

7’h64

93.1kΩ

115kΩ

4’h5

7’h65

113kΩ

158kΩ

4’h6

7’h66

105kΩ

165kΩ

4’h7

7’h67

97.6kΩ

174kΩ

4’h8

7’h68

115kΩ

232kΩ

4’h9

7’h69

100kΩ

232kΩ

4’hA

7’h6A

90.9kΩ

243kΩ

4’hB

7’h6B

90.9kΩ

287kΩ

4’hC

7’h6C

69.8kΩ

261kΩ

4’hD

7’h6D

59kΩ

261kΩ

4’hE

7’h6E

47.5kΩ

261kΩ

4’hF

7’h6F 2

All resistors are 1% tolerance.

Optionally, connecting the ASEL pin to AGND sets the 7-bit address to 7’h60 and connecting the ASEL pin to BIASAF

sets the 7-bit address to 7’h6F.

This is also the SM Bus device default address. If using this address, it is the responsibility of the user to ensure there

is no contention on the bus.

Telemetry Readback

The LT3074 features an integrated 12-bit first order sigma-delta analog-to-digital converter (ADC) that monitors and

performs conversions on the output voltage, output current, input voltage, bias voltage, and temperature. The ADC

operates at a 1MHz clock frequency and is used in a round-robin fashion to monitor the physical quantities measured.

The output voltage and output current are measured with a 12-bit resolution approximately every 9.216ms. The input

voltage and bias voltage is measured with a 10-bit resolution approximately every 23.04ms. The die temperature is

measured with a 10-bit resolution approximately every 46.08ms. Figure 90 shows the round-robin pattern in which

the voltages, current, and temperature are measured, as well as the conversion times associated with each

measurement.

Figure 90. ADC Round-Robin Pattern

Fault Reporting and the ALERT pin

The LT3074 supports various overvoltage, undervoltage, overcurrent, minimum current, and overtemperature faults

and warnings. The ALERT pin is asserted low in response to any fault or warning that sets one or more bits of the

STATUS_BYTE and/or STATUS_WORD register. Figure 91 gives a summary of the fault bits reported by the LT3074.

MEASUREMENT

tCONV

VOUT

(12-BIT)

4.096ms

IOUT

(12-BIT)

4.096ms

VIN

(10-BIT)

1.024ms

VOUT

(12-BIT)

4.096ms

IOUT

(12-BIT)

4.096ms

VBIAS

(10-BIT)

1.024ms

VOUT

(12-BIT)

4.096ms

IOUT

(12-BIT)

4.096ms

VIN

(10-BIT)

1.024ms

VOUT

(12-BIT)

4.096ms

IOUT

(12-BIT)

4.096ms

VBIAS

(10-BIT)

1.024ms

TEMP

(10-BIT)

1.024ms

VOUT

(12-BIT)

4.096ms

IOUT

(12-BIT)

4.096ms

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