bq24070
bq24071
www.ti.com
SLUS694B–MARCH 2006–REVISED AUGUST 2006
FUNCTIONAL DESCRIPTIONS (continued)
V
BAT
V
OUT
Figure 7. Insert Battery – Power-Up Output via BAT
Figure 8 illustrates USB boot up and power-up via USB; channel 1 (CH1) V(USH) = 0 to 5 V; channel 2 (CH2)
USB input current (0.2 A/div); Mode = Low; CE = High; ISET2 = High; VBAT = 3.85 V; V(DPPM) = 3.0 V (V(DPPM)
×
1.15 < VBAT, otherwise DPPM mode increases time duration). When a USB source is applied (if AC is not
present), the CE pin and ISET2 pin are ignored during the boot-up time and a maximum input current of 100 mA
is made available to the OUT or BAT pins. After the boot-up time, the IC implements the CE and ISET2 pins as
programmed.
V
AC
I
USB
Figure 8. USB Boot-Up Power-Up
Battery Temperature Monitoring
The bq24070/1 continuously monitors battery temperature by measuring the voltage between the TS and VSS
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