Datasheet

UCD9244
www.ti.com SLVSAL6A –NOVEMBER 2010–REVISED FEBRUARY 2011
Table 1. PIN FUNCTIONS
PIN PIN LABEL PIN DESCRIPTION
NUMBER
1 CS4A Power stage 4A current sense input and input to analog comparator 4
2 CS3A Power stage 3A current sense input and input to analog comparator 3
3 CS2A Power stage 2A current sense input and input to analog comparator 2
4 VinMon Input Voltage monitor
5 Temp1/AuxADC1 Temperature sense input for Rail 1, or Auxiliary ADC input 1
6 Temp2/AuxADC2 Temperature sense input for Rail 2, or Auxiliary ADC input 2
7 V33DIO1 Digital Input / Output 3.3V supply
8 Dgnd1 Digital ground
9 nRESET Active low device reset input. Pull up to 3.3V with a 10k ohm resistor
10 JTAG_RCK JTAG Return Clock
11 FLT1A Fault indicator for stage 1A
12 VID1S VID Select pin for Rail 1
13 FLT2A Fault indicator for stage 2A
14 VID2S VID Select pin for Rail 2
15 PMBus_Clk PMBus Clock. Pull up to 3.3V with a 2k ohm resistor
16 PMBus_Data PMBus Data. Pull up to 3.3V with a 2k ohm resistor
17 DPWM1A Digital Pulse Width Modulator output 1A
18 VID1C VID input pin for Rail 1 - most significant bit
19 DPWM2A Digital Pulse Width Modulator output 2A
20 VID2A VID input pin for Rail 2 - least significant bit
21 DPWM3A Digital Pulse Width Modulator output 3A
22 VID2B VID input pin for Rail 2
23 DPWM4A Digital Pulse Width Modulator output 4A
24 Power_Good Power Good Indication
25 FLT3A Fault indicator for stage 3A
26 Dgnd2 Digital Ground
27 PMBus_Alert PMBus Alert. Pull up to 3.3V with a 2k ohm resistor
28 PMBus_Cntrl PMBus Control. Pull up to 3.3V with a 2k ohm resistor
29 VID2C VID input pin for Rail 2 - most significant bit
30 VID3A VID input pin for Rail 3 - least significant bit
31 VID3B VID input pin for Rail 3
32 VID3C VID input pin for Rail 3 - most significant bit
33 VID3S VID Select pin for Rail 3
34 FLT4A Fault indicator for stage 4A
35 VID4S VID Select pin for Rail 4
36 VID4A/JTAG_TCK Mux'ed pin - VID input pin for Rail 4 (LSB), JTAG Test Clock
37 VID4B/JTAG_TDO Mux'ed pin - VID input pin for Rail 4, JTAG Test Data Output
38 SyncIn/JTAG_TDI Mux'ed pin - SyncIn, JTAG Test Data In. Tie to V33D with 10kohm resistor
39 VID4C/JTAG_TMS Mux'ed pin - VID input for rail 4 (MSB); JTAG Test mode select. Tie to V33D with a 10kohm resistor
40 JTAG_nTRST JTAG Test Reset - Tie to ground with a 10kohm resistor
41 VID1A VID input pin for Rail 1 - least significant bit
42 VID1B VID input pin for Rail 1
43 Dgnd3 Digital Ground
44 V33DIO2 Digital Input / Output 3.3V supply
45 V33D Digital core 3.3V supply
46 V33A Analog 3.3V supply
47 BPCap 1.8V Bypass Capacitor -- tie 0.1 µF cap to analog ground
© 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Link(s) :UCD9244