DS2792 datasheet(19/40 Pages) MAXIM

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DS2792 Programmable Fuel Gauge with UART Interface

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Table 6. Peripheral Register Reset Values

PPU

PAF

EIC

EINT

CCCON

TTC

ICDT0

ICDT1

ICDC

ICDF

ICDB

ICDA

ICDD

SINT

SMASK

SMD

SBUF

SCON

SADEN

SADDR

BRE

Note: s indicates bit reflects pin state.

ON-CHIP REGULATOR

The DS2792 provides a regulated 3.3V output on the VB pin capable of supplying up to 2mA of current to external

circuitry. The regulated supply can be used to level shift the I/O lines and/or provide a reference voltage for the Vx

pin to measure a pack ID resistor or thermistor. The regulator output is always active regardless of the DS2792’s

mode of operation.

SYSTEM INTERRUPTS

Multiple interrupt sources are available for quick response to internal and external events. The MAXQ20

architecture uses a single interrupt vector (IV), single interrupt-service routine (ISR) design. For maximum flexibility,

interrupts can be enabled globally, individually, or by module. When an interrupt condition occurs, its individual flag

is set, even if the interrupt source is disabled at the local, module, or global level. Interrupt flags must be cleared

within the firmware-interrupt routine to avoid repeated interrupts from the same source. Application software must

ensure a delay between the write to the flag and the RETI instruction to allow time for the interrupt hardware to

remove the internal interrupt condition. Asynchronous interrupt flags require a one-instruction delay and

synchronous interrupt flags require a two-instruction delay.

When an enabled interrupt is detected, execution jumps to a user-programmable interrupt vector location. The IV

must determine whether a jump to 0000h came from a reset or interrupt source.

Once control has been transferred to the ISR, the interrupt identification register (IIR) can be used to determine if a

system register or peripheral register was the source of the interrupt. The specified module can then be

interrogated for the specific interrupt source and software can take appropriate action. Interrupts are evaluated by

application code allowing the definition of a unique interrupt priority scheme for each application. Interrupt sources

are available from the watchdog timer described in the MAXQ Users Guide, the SINT register described in the

UART Interrupts section, and the EINT register as shown in Figure 7.

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