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ISL25700FRUZ-T7A bảng dữ liệu(PDF) 11 Page - Intersil Corporation

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ISL25700
11
FN6885.0
September 3, 2010
Device ID Register (Reg.00h)
This is a read only register. It contains device ID code 00h.
Coarse Temperature Control (Reg.01h [2:0])
These 3 bits allow one to choose one of the seven coarse
windows for the temperature set point. The default set
point is about +59°C for the 100k RTH thermistor with a
temperature coefficient of -4.25%/°C at +25°C, i.e.
Reg.01h[2:0] = 011b. The temperature set point can be
changed to any other set point within an operational
range from +40°C to +110°C, or use another type of
thermistor, including different resistance value or R/T
curve type (NTC slope), and then center the +15°C
coarse range temperature window on that new setting
based on the ratio of RINT/RTH according to Equation 1:
where:
RINT - is an internal 9kΩ resistor, forming another leg of
the Wheatstone Bridge;
K1, K2 and K3 - are coefficients representing the ratio of
the current flowing through the legs of the Wheatstone
Bridge;
Code - is the decimal code in the Fine Temperature
Control register 02h.
The value of internal resistor RINT can vary from part to
part and depends on the package temperature. The
actual RINT at temperature T can be calculated using
Equation 2:
where:
RINT(25) = 9000 + RINT abs. error x 15 - is internal
resistor value at +25°C in Ohms;
RINT abs. error - is a signed integer value of absolute
error stored in Reg.07h[7:0] converted to a decimal
number; bit [7] represents a sign bit, 0 for “+” and 1 for
“-”;
- 1st order temperature coefficient,
ppm/°C;
- 2nd order temperature coefficient,
ppm/°C2;
T - temperature in Celsius.
The K1, K2 and K3 coefficients and the thermistor value
range for each Coarse Temperature setting in
Reg.01h[2:0] should be taken according to Table 2.
Current Sense Threshold (Reg.01h [7:3])
This register sets the current limit trip point. When the
voltage applied to the ISENSE pin falls below the
programmed voltage threshold, VOUT goes high, thus
forming a negative feedback loop proportional to ISENSE
x RSENSE.
The value for this register should be taken according to
Table 3.
TABLE 1. ISL25700 MEMORY MAP
REGISTER NAME
REGISTER
ADDRESS
BIT MAP
DEFAULT
SETTINGS
7
6543210
Device ID (Read Only)
00h
ID[7]
ID[6]
ID[5]
ID[4]
ID[3]
ID[2]
ID[1]
ID[0]
00h
Current Sense/
Coarse Temperature Control
01h
CS[4]
CS[3]
CS[2]
CS[1]
CS[0] CTC[2] CTC[1] CTC[0]
03h
Fine Temperature Control
02h
FTC[7] FTC[6] FTC[5] FTC[4] FTC[3] FTC[2] FTC[1] FTC[0]
80h
Gain Control (DAC Enable/
DAC Gain/System Loop Gain)
03h
DAC
Enable
DAC
Gain
NA
SLG[4] SLG[3] SLG[2] SLG[1] SLG[0]
90h
General Purpose DAC
04h
DAC[7] DAC[6] DAC[5] DAC[4] DAC[3] DAC[2] DAC[1] DAC[0]
80h
General Purpose Register 1
05h
GP1[7] GP1[6] GP1[5] GP1[4] GP1[3] GP1[2] GP1[1] GP1[0]
00h
General Purpose Register 2
06h
GP2[7] GP2[6] GP2[5] GP2[4] GP2[3] GP2[2] GP2[1] GP2[0]
00h
RINT Absolute Error (Read Only)
07h
sign bit ERR[6] ERR[5] ERR[4] ERR[3] ERR[2] ERR[1] ERR[0]
XX
Control/Status Register
(Volatile Only)
08h
NV
NA
NA
NA
NA
NA
NA
BUSY
00h
RINT T
()
RTH setpoint
()
-----------------------------------------
K2 K3 Code
255
---------------
×
+
K1
--------------------------------------------
=
(EQ. 1)
RINT T
()
RINT 25
()x1 α T25
() β T25
()2
++
[]
=
(EQ. 2)
TABLE 2. COARSE TEMPERATURE RANGE
Register
01h[2:0]
K1
K2
K3
THERMISTOR
RESISTANCE RANGE
AT SET POINT (kΩ)
000
Do not use
001
3
3
2
5.4 to 9.0
010
4
3
2
7.2 to 12.0
100
5
3
2
9.0 to 15.0
011
7
3
2
12.6 to 21.0
101
8
3
2
14.4 to 24.0
110
9
3
2
16.2 to 27.0
111
12
3
2
21.6 to 36.0
α
1337
6
×10
=
β 5
6
×10
=


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