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ISL6363_14 Datasheet, PDF (28/32 Pages) Intersil Corporation – Multiphase PWM Regulator for VR12™ Desktop CPUs
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ISL6363
Programming Resistors
There are three programming resistors: Rprog1, Rprog2 and
Raddr. Table 7 shows how to select Rprog1 based on VBOOT and
IMAX_CR register settings. VR1 can power to 0V VBOOT or an
internally-set VBOOT based on Rprog1 value. When the controller
works with an actual CPU, select Rprog1 such that VR1 powers up
to VBOOT = 0V as required by the SVID command. In the absence
of a CPU, such as testing of the only the VR, select Rprog1 such
that VR1 powers up to the internally-set VBOOT, which by default
is 1.1V. Determine the maximum current VR1 can support and
set the IMAX_CR register value accordingly by selecting the
appropriate Rprog1 value. The CPU will read the IMAX_CR register
and ensures that the CPU CORE current doesn’t exceed the value
specified by IMAX_CR.
Table 8 shows how to select Rprog2 based on TMAX and
IMAX_GR register settings. There are four TMAX temperatures to
choose from: +120°C, +110°C, +105°C, and +95°C. There are
also four IMAX_GR values to choose from: 35A, 30A, 25A and
20A.
TABLE 7. RPROG1 PROGRAMMING TABLE
RPROG1
(kΩ)
BOOT
(V)
IMAX
IMAX
IMAX
IMAX
CORE
CORE
CORE
CORE
Nph = 4 (A) Nph = 3 (A) Nph = 2 (A) Nph = 1 (A)
7.15
1.1
100
75
50
25
13.0
1.1
108
81
54
27
20.5
1.1
116
87
58
29
27.4
1.1
124
93
62
31
38.3
1.1
132
99
66
33
52.3
1.1
140
105
70
35
66.5
1.1
148
111
74
37
80.6
0
148
111
74
37
95.3
0
140
105
70
35
113
0
132
99
66
33
137
0
124
93
62
31
165
0
116
87
58
29
196
0
108
81
54
27
226
0
100
75
50
25
Open
0
92
69
46
23
Circuit
TABLE 8. RPROG2 PROGRAMMING TABLE
RPROG2 (kΩ)
TMAX (°C)
IMAX_GR (A)
7.15
120
30
13.0
120
25
20.5
120
20
27.4
110
20
38.3
110
25
52.3
110
30
66.5
110
35
80.6
105
35
95.3
105
30
113
105
25
137
105
20
165
95
20
196
95
25
226
95
30
Open Circuit
95
35
Table 9 shows how to select Rprog2 based on TMAX and
IMAX_GR register settings. There are four TMAX temperatures to
choose from: +120°C, +110°C, +105°C, and +95°C. There are
also four IMAX_GR values to choose from: 35A, 30A, 25A and
20A.
TABLE 9. RADDR PROGRAMMING TABLE
RADDR
(kΩ)
VR1 AND VR1 SVID ADDRESS
0
0,1
7.15
0,1
13
2,3
20.5
2,3
27.4
4,5
38.3
4,5
52.3
6,7
66.5
6,7
80.6
8,9
95.3
8,9
113
A,B
137
A,B
165
C,D
196
C,D
226
0,1
Open Circuit
0,1
28
FN6898.1
September 5, 2013
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