UCD3040_15 Datasheet, PDF (49/81 Pages) Texas Instruments – Digital Power Controllers

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UCD3040
UCD3028
UCD3020
SLUS868H – DECEMBER 2009 – REVISED OCTOBER 2013
AD00,
AD01
Pin
V_DD
I_BIAS
On/Off Control
Resistor to
Set PMBus
Address
To ADC Mux
Figure 17. PMBus Address-Detection Method
Table 6. PMBus Address Bins
ADDRESS
12
11
10
9
8
7
6
5
4
3
2
1
0
VOLTAGE, V
2.299
1.815
1.463
1.177
0.953
0.749
0.604
0.486
0.383
0.308
0.249
0.196
0.157
RESISTOR, kΩ
209
165
133
107
86.6
68.1
54.9
44.2
34.8
28.0
22.6
17.8
14.3
A low impedance (short) on the address pin may produce a voltage below the minimum voltage. Also, a high
impedance (open) on the address pin may produce a voltage above the maximum voltage. In these cases, the
user may design the system to use a default PMBus address.
FAULT PORTS/GIO
Programmer's Reference Manual: UCD30xx Faults and External Interrupts (GIO) Programmer’s Manual
The general-purpose input/output (GIO) ports are for pins that are not associated with any hardware
communication port. These bidirectional pins can be configured by firmware to set the pin to a 1 or 0 value as an
output signal. Or the bidirectional pins can be read as inputs through memory-map reads for determining the
digital value of the pin. Two of the pins, INT1 and INT2, have additional external interrupt capability. These
interrupts can be configured for either falling- or rising-edge detection. Interrupts can be enabled or disabled and
flags can be monitored for level status.
For naming purposes, all fault input pins are GIO and are typically used in most power-controller applications as
fault-input connections.
TIMERS
Programmer's Reference Manual: UCD30xx Timer Modules Programmer’s Manual
External to the Fusion Digital Power peripherals, there are three different types of timers in UCD30xx. They are
the 24-bit timer, the 16-bit timer, and the watchdog timer.
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