DS2790G+T&R Maxim Integrated Products, DS2790G+T&R Datasheet - Page 21

• Manufacturer Part Number: DS2790G+T&R
• Description: IC FUEL GAUGE BATT 28-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of DS2790G+T&R

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS2790 Programmable 1-Cell Li-Ion Fuel Gauge and Protector
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
register defaults to 0000h on reset or power-up, so if it is not changed to a different address, application firmware
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 TWSINT Register described in the
2-Wire Interface section, and the EINT Register as shown in Figure 6.
EINT Register
The EINT Register contains interrupts generated by the ADC, the timer-counter, the protection circuits, the general
purpose port pins and the serial-interface port pins. Their masks and their configuration bits, along with the RST pin
status and control, are present in the EIC and PAF registers of module 0.
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