LTC6952 datasheet(36/80 Pages) AD

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LTC6952

6952f

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Preliminary Technical Data

Advance Product Information Subject to Change

Rev PrA

OPERATION

STAT Output

The STAT output pin is configured with the x[6:0] bits and

INVSTAT of register h01. These bits are used to bit-wise

mask, or enable, the corresponding status flags of status

matically in Figure 23. The result of this bit-wise Boolean

operation is then output on the STAT pin.

STAT = (OR (Reg00[6:0] AND Reg01[6:0]))

XOR INVSTAT

(2)

6952 F23

X[0]

REFOK

INVSTAT

STAT

TEMPO

X[1]

REFOK

X[2]

VCOOK

X[4]

LOCK

X[5]

LOCK

X[6]

UNLOCK

X[3]

VCOOK

Figure 23. STAT Simplified Schematic

For example, if the application requires STAT to go high

whenever the LOCK, VCOOK, or REFOK flags are set, then

x[4], x[2], and x[0] should be set to “1” and INVSTAT

should be set to “0”, giving a register value of h15.

The STAT pin may be transformed to a temperature mea-

surement diode with internal 300µA bias current by setting

bit TEMPO in register h05 to “1”. To get an approximate

die temperature, a single calibration point is needed first.

Measure the STAT pin voltage (VTEMPC) with the LTC6952

powered down (PDALL = 1) at a known temperature (TCAL).

Then the operating temperature may be calculated in a

desired application by measuring the STAT voltage again

(VTEMP) and using the following equation:

T = 665 × (VTEMPC – VTEMP) + TCAL

where T and TCAL are in ºC. Note that no external bias

current is required. Allow 50µs settling time after setting

TEMPO to “1”.

BLOCK POWER-DOWN CONTROL

The LTC6952’s power-down control bits are located in

the device may be powered down independently. To power

down individual outputs, see Table 10. Care must be taken

with the LSB of this register, the POR (power-on-reset)

bit. When written to “1”, this bit forces a full reset of the

part’s digital circuitry to its power-up default state.

LTC6952 Datasheet(PDF) 36 Page - Analog Devices

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