ISL6329 Datasheet, PDF (26/38 Pages) Intersil Corporation – Dual PWM Controller Powering AMD SVI Split-Plane Processors

I²C Read and Write Protocol
WRITE TO A SINGLE REGISTER
S 1000_1100 A 0000_0000 A RGS1_DATA A P
ISL6329
WRITE TO ALL REGISTERS
S 1000_1100 A 0000_0000 A RGS0_DATA A RGS1_DATA A RGS2_DATA A P
READ FROM SINGLE REGISTER
S 1000_1100 A REG_ADDR A P S 1000_1101 A RGS0_DATA N P
READ FROM ALL REGISTERS
S 1000_1100 A 0000_0000 A P S 1000_1101 A RGS0_DATA A RGS1_DATA A RGS2_DATA N P
DRIVEN BY MASTER
S = START CONDITION
A = ACKNOWLEDGE
DRIVEN BY ISL6329
P = STOP CONDITION
Register Bit Definitions
The bits for RGS0 and RGS1 are utilized in the same manner by
the ISL6329 (see Table 5). Bit-7 enables the overvoltage
protection trip point to be increased. Bit-6 enables the Power-
good trip point to be increased. These bits will be interpreted by
the ISL6329 according to Table 7. Bits 5 through 0 determine the
amount of offset for the particular regulator. See Table 8 for the
bit codes and the corresponding offset voltages from the
nominal DAC.
TABLE 7. BIT [7] AND [6] of REGISTER RGS0 AND RGS1
BIT 7
OVP TRIP LEVEL
0
1
BIT 6
1.8V or V_DAC + 250mV, whichever is greater
1.8V or V_DAC + 500mV, whichever is greater
PGOOD TRIP LEVEL
0
VDAC_CORE +250mV/-300mV
VDAC_NB - 300mV
1
VDAC_CORE +300mV/-350mV
VDAC_NB - 350mV
NOTE: All Pgood trip points have 50mV hysteresis
TABLE 8. BITS [5:0] REGISTER RGS0 and RGS1 (VOLTAGE
MARGINING OFFSET)
BIT5
BIT4
BIT3
BIT2
BIT1
BIT0
V_OFFSET
VO5 VO4 VO3 VO2 VO1 VO0
(mV)
1
0
0
0
0
0
-800
1
0
0
0
0
1
-775
1
0
0
0
1
0
-750
1
0
0
0
1
1
-725
1
0
0
1
0
0
-700
1
0
0
1
0
1
-675
1
0
0
1
1
0
-650
N = NO ACKNOWLEDGE
TABLE 8. BITS [5:0] REGISTER RGS0 and RGS1 (VOLTAGE
MARGINING OFFSET) (Continued)
BIT5
VO5
BIT4
VO4
BIT3
VO3
BIT2
VO2
BIT1
VO1
BIT0
VO0
V_OFFSET
(mV)
1
0
0
1
1
1
-625
1
0
1
0
0
0
-600
1
0
1
0
0
1
-575
1
0
1
0
1
0
-550
1
0
1
0
1
1
-525
1
0
1
1
0
0
-500
1
0
1
1
0
1
-475
1
0
1
1
1
0
-450
1
0
1
1
1
1
-425
1
1
0
0
0
0
-400
1
1
0
0
0
1
-375
1
1
0
0
1
0
-350
1
1
0
0
1
1
-325
1
1
0
1
0
0
-300
1
1
0
1
0
1
-275
1
1
0
1
1
0
-250
1
1
0
1
1
1
-225
1
1
1
0
0
0
-200
1
1
1
0
0
1
-175
1
1
1
0
1
0
-150
1
1
1
0
1
1
-125
1
1
1
1
0
0
-100
1
1
1
1
0
1
-75
1
1
1
1
1
0
-50
26
FN7800.0
April 19, 2011