UCD3028RMHT datasheet(49/81 Pages) TI1

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BIAS

To ADCMux

Resistorto

SetPMBus

Address

On/OffControl

AD00,

AD01

UCD3040

UCD3028

UCD3020

www.ti.com

SLUS868H – DECEMBER 2009 – REVISED OCTOBER 2013

Figure 17. PMBus Address-Detection Method

Table 6. PMBus Address Bins

ADDRESS

VOLTAGE, V

RESISTOR, k

Ω

2.299

209

1.815

165

1.463

133

1.177

107

0.953

86.6

0.749

68.1

0.604

54.9

0.486

44.2

0.383

34.8

0.308

28.0

0.249

22.6

0.196

17.8

0.157

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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