Datasheet

UCD9222
www.ti.com SLVSAL7A –NOVEMBER 2010–REVISED FEBRUARY 2011
Table 1. PIN FUNCTIONS
PIN NO. PIN LABEL DESCRIPTION
1 IinMon/AuxADC4 Input current monitor, or Auxiliary ADC input 4
2 Temp2/AuxADC2 Temperature sense input for Rail 2, or Auxiliary ADC input 2
3 CS2A Power stage 2A current sense input and input to analog comparator 2
4 VinMon Input voltage monitor
5 nRESET Active low device reset input. Pull up to 3.3V with a 10k ohm resistor
6 FLT1A Fault indicator for stage 1A
7 VID1S VID Select pin for Rail 1
8 FLT2A Fault indicator for stage 2A
9 VID2S VID Select pin for Rail 2
10 PMBus_Clk PMBus Clock. Pull up to 3.3V with a 2k ohm resistor
11 PMBus_Data PMBus Data. Pull up to 3.3V with a 2k ohm resistor
12 DPWM1A Digital Pulse Width Modulator output 1A
13 PG1 Rail 1 Power Good Indicator
14 DPWM2A Digital Pulse Width Modulator output 2A
15 PG2 Rail 2 Power Good Indicator
16 VID1A VID input pin for Rail 1 – least significant bit
17 PowerGood Power Good Indication
18 VID1B VID input pin for Rail 1
19 PMBus_Alert PMBus Alert. Pull up to 3.3V with a 10k ohm resistor
20 PMBus_Cntrl PMBus Control. Pull up to 3.3V with a 10k ohm resistor
21 VID1C VID input pin for Rail 1 – most significant bit
22 VID2A VID input pin for Rail 2 – least significant bit
23 VID2B VID input pin for Rail 2
24 VID2C VID input pin for Rail 2 – most significant bit
25 EN1 Rail 1 Enable
26 EN2 Rail 2 Enable
27 JTAG_TCK JTAG Test Clock
28 SyncOut/JTAG_TDO Mux'ed pin JTAG Test Data Output, DPWM Sync Output
29 SyncIn/JTAG_TDI Mux'ed pin – JTAG Test Data In, DPWM Sync Input
30 JTAG_TMS JTAG Test mode select. Pull up to 3.3V with a 10k ohm resistor
31 (JTAG) nTRST JTAG Test Reset – Tie to ground with a 10k ohm resistor
32 Dgnd3 Digital Ground
33 V33DIO 3.3V supply for Digital I/O and Core
34 V33A Analog 3.3V supply
35 BPCap 1.8V Bypass Capacitor – tie 0.1 µF cap to analog ground
36 Agnd2 Analog ground
37 EAp1 Error analog, differential voltage, Positive channel 1 input
38 EAn1 Error analog, differential voltage, Negative channel 1 input
39 EAp2 Error analog, differential voltage, Positive channel 2 input
40 EAn2 Error analog, differential voltage, Negative channel 2 input
41 V33FB Connection to the base of 3.3V linear regulator transistor (no connect if unused)
42 CS1A Power stage 1A current sense input and input to analog comparator 1
43 Addr1 PMBus Address sense. Channel 1.
44 Addr0 PMBus Address sense. Channel 0.
45 Vtrack/AuxADC3 Tracking voltage input, or Auxiliary ADC input 3
46 Temp1/AuxADC1 Temperature sense input for Rail 1, or Auxiliary ADC input 1
47 Agnd3 Analog ground
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