Datasheet

Note: V
SRO
is the voltage difference between SR1 and SR2 plus the offset voltage V
OS
.
3
BD201801.eps
Differential
Dynamically
Balanced VFC
System
I/O
and
Control
RAM
and
Counters
128 x 8
Counter
Control
Temperature-
Compensated
Precision
Oscillator
Bandgap
Voltage
Reference
Temperature
Sensor
SR1
SR2
HDQ
RBI
V
DD
(Internal)
Optional
(External)
ds
g
REG
V
CC
V
SS
Timer
Calibration
and Power
Control
WAKE
V
ref
Figure 1. bq2018 Block Diagram
bq2018
HDQ Pin DCR/CCR/SCR WOE WAKE Operating State
HDQ High yes |V
SRO
| > V
WOE
Low Normal
HDQ High yes |V
SRO
| < V
WOE
High Z Normal
HDQ Low no |V
SRO
| < V
WOE
High Z Sleep
Table 1. Operational States