Datasheet

ADDR1
UCD9222
VID1A VID2A
VID1B VID2B
VID1C VID2C
VID1S VID2S
VID Device #1
VCNTL[0]
VCNTL[1]
VCNTL[2]
VCNTL[3]
VID Device #2
VCNTL[0]
VCNTL[1]
VCNTL[2]
VCNTL[3]
UCD9222
SLVSAL7A –NOVEMBER 2010– REVISED FEBRUARY 2011 www.ti.com
Table 2. PMBus Address Bins
(1)
ADDR0
(short) (open)
42.2k 48.7k 56.2k 64.9k 75k 86.6k 100k 115k 133k 154k 178k 205k
< 36.5k > 237k
< 36.5k
126 126 126 126 126 126 126 126 126 126 126 126 126 126
(short)
42.2k 126 126
(2)
1 2 3 4 5 6 7 8 9 10 11
(3)
126
48.7k 126 126
(2)
13 14 15 16 17 18 19 20 21 22 33 126
56.2k 126 24 25 26 27 28 29 30 31 32 33 34 35 126
64.9k 126 36 37 38 39 40 41 42 43 44 45 46 47 126
75k 126 48 49 50 51 52 53 54 55 56 57 58 59 126
86.6k 126 60 61 62 63 64 65 66 67 68 69 70 71 126
100k 126 72 73 74 75 76 77 78 79 80 81 82 83 126
115k 126 84 85 86 87 88 89 90 91 92 93 94 95 126
133k 126 96 97 98 99 100 101 102 103 104 105 106 107 126
154k 126 108 109 110 111 112 113 114 115 116 117 118 119 126
178k 126 120 121 122 123 124 125 126 126
(2)
126 126 126 126 126
205k 126 126 126 126 126 126 126 126 126 126 126 126 126 126
> 237k
126 126 126 126 126 126 126 126 126 126 126 126 126 126
(open)
(1) Shaded addresses are not recommended as they will cause conflict when multiple devices are used.
(2) Reserved. Do not use.
(3) Conflicts with ROM. Do not use.
VID Interface
The UCD9222 supports VID (Voltage Identification) inputs from up to two external VID enabled devices. The VID
codes may be 4-, 6-, or 8-bit values; the format is selected using the VID_CONFIG PMBus command. In 4- and
6-bit mode, each host uses four VID input signals (VID_A, VID_B, VID_C, and VID_S) to send VID codes to the
UCD9222. In 8-bit mode, the PMBus input is used to receive VID commands from the VID devices’ I
2
C
interfaces.
Figure 5. One UCD9222 Controlled by Two DSP/ASICs Using 4-bit or 6-bit VID Format
Regardless of which VID mode is used, the commanded output voltage reference is set according to this formula:
Vref_cmd = (VID_CODE × VID_Slope) + VID_Offset,
where
VID_Slope = (VID_Vout_High – VID_Vout_Low) / ((2^VID_Format) -1),
and
VID_Offset = VID_Vout_Low.
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