LTC6953 datasheet(28/56 Pages) AD

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LTC6953

Rev 0

For more information www.analog.com

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 18. The result of this bit-wise boolean

operation is then output on the STAT pin if TEMP0 is “0”.

STAT

= OR Reg00 6 : 0

[

] AND Reg01 6 : 0

[

]

(

)

(

) XOR INVSTAT (2)

For example, if the application requires STAT to go high

whenever the VCOOK flag is set, then x[2] should be set

to “1” and INVSTAT should be set to “0”, giving a register

value of h04. Since only VCOOK and VCOOK are used for

the LTC6953, only bits x[3:2] should be used. Bits x[6:4]

and x[1:0] should always be set to 0.

The STAT pin may be transformed to a temperature mea-

surement 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 LTC6953

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

(VTEMP) and using Equation 3:

= 665 • VTEMPC – VTEMP

(

) + TCAL

(3)

where T and TCAL are in ºC, and VTEMPC and VTEMP are

in V. Note that no external bias current is required. Allow

50µs settling time after setting TEMPO to “1”.

Block Power-Down Control

The LTC6953’s power-down control bits are located in

the device may be powered down independently. To power

down individual outputs, see Table 3. 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.

Figure 18. STAT Simplified Schematic

6953 F18

X[0]

INVSTAT

STAT

TEMPO

X[1]

X[2]

VCOOK

X[4]

X[5]

X[6]

X[3]

VCOOK

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