Datasheet

UCD9246
SLVSA34 –JANUARY 2010 www.ti.com
PIN DESCRIPTIONS
PIN NO. PIN NAME DESCRIPTION
1 CS-4A Power stage 4A current sense input and input to analog comparator 4
2 CS-3A Power stage 3A current sense input and input to analog comparator 3
3 CS-2A Power stage 2A current sense input and input to analog comparator 2
4 V
in
/I
in
Input supply sense, alternates between V
in
and I
in
5 Vtrack Voltage track input
6 Temperature Temperature sense input
7 V33DIO Digital I/O 3.3 V supply
8 DGND1 Digital Ground
9 nRESET Active low device reset input, pullup to 3.3V with 10 kΩ resistor
10 TRCK JTAG Test return clock
11 FLT-1A External fault input 1A, active high
12 FLT-1B External fault input 1B, active high
13 FLT-2A External fault input 2A, active high
14 FLT-2B External fault input 2B, active high
15 PMBus_Clock PMBus Clock, pullup to 3.3 V with 2 kΩ resistor
16 PMBus_Data PMBus Data, pullup to 3.3 V with 2 kΩ resistor
17 DPWM-1A Digital Pulse Width Modulator output 1A
18 DPWM-1B Digital Pulse Width Modulator output 1B
19 DPWM-2A Digital Pulse Width Modulator output 2A
20 DPWM-2B Digital Pulse Width Modulator output 2B
21 DPWM-3A Digital Pulse Width Modulator output 3A
22 SRE-1A Synchronous rectifier enable output 1A, active high
23 DPWM-4A Digital Pulse Width Modulator output 4A
24 SRE-1B Synchronous rectifier enable output 1B, active high
25 FLT-3A External fault input 3A, active high
26 DGND2 Digital Ground
27 PMBus_Alert PMBus Alert, pullup to 3.3V with 2 kΩ resistor
28 PMBus_Cntl PMBus Control, pullup to 3.3V with 2 kΩ resistor
29 SRE-3A Synchronous rectifier enable output 3A, active high
30 SRE-4A Synchronous rectifier enable output 4A, active high
31 TMUX-0 Temperature multiplexer select output S0, Vin/Iin select
32 TMUX-1 Temperature multiplexer select output S1
33 SRE-2A Synchronous rectifier enable output 2A, active high
34 FLT-4A External fault input 4A, active high
35 SRE-2B Synchronous rectifier enable output 2B, active high
36 TCK/SEQ-1 JTAG Test Clock (multiplexed with Sequencing Input/Output)
37 TDO/Sync_Out JTAG Test data out (multiplexed with Synchronization Output from DPWM)
38 TDI/Sync_In JTAG Test data in tie to V
33D
with 10kΩ resistor (multiplexed with Synchronization Input to DPWM)
39 TMS/PGood JTAG Test mode select – tie to V
33D
with 10kΩ resistor (multiplexed with Power Good indication, Active
high open-drain output. Pull-up to 3.3V with 10kΩ resistor.)
40 nTRST JTAG Test reset – tie to ground with 10kΩ resistor
41 SEQ-2 Sequencing Input/Output
42 TMUX-2 Temperature multiplexer select output S2
43 DGND3 Digital Ground
44 V33DIO Digital I/O 3.3V supply
45 V33D Digital core 3.3V supply
46 V33A Analog 3.3V supply
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