Datasheet

munication timing specification and illustration sec-
tions.
Communication with the bq2013H is always performed
with the least-significant bit being transmitted first. Fig-
ure 3 shows an example of a communication sequence to
read the bq2013H NACH register.
bq2013H Command Code and
Registers
The bq2013H status registers are listed in Table 9 and
described below.
Command Code
The bq2013H latches the command code when eight
valid command bits have been received by the bq2013H.
The command code register contains two fields:
■
W/R bit
■
Command address
The W/R
bit of the command code is used to select
whether the received command is for a read or a write
function.
The W/R
location is:
Command Code Bits
76543 2 1 0
W/R
- -- - - - -
Where W/R is:
0 The bq2013H outputs the requested regis-
ter contents specified by the address por-
tion of command code.
1 The following eight bits should be written
to the register specified by the address por-
tion of command code.
The lower seven-bit field of command code contains the
address portion of the register to be accessed. Attempts
to write to invalid addresses are ignored.
Command Code Bits
765 4 3 2 1 0
- AD6 AD5 AD4 AD3 AD2 AD1
AD0
(LSB)
10
bq2013H
Symbol Parameter Typical Maximum Units Notes
INL
Integrated non-linearity
error
±
2
±
4
%
Add 0.1% per °C above or below 25°C
and 1% per volt above or below 4.25V.
INR
Integrated non-
repeatability error
±
1
±
2
%
Measurement repeatability given
similar operating conditions.
Table 8. bq2013H Current-Sensing Errors
TD2013H.eps
DQ
Break 0 0 0 0 0 0 1 0 1 0 0 1
Written by Host to bq2013H
CMDR = 03h
Received by Host from bq2013H
NAC = 65h
LSB MSB LSB MSB
1110
t
RSPS
Figure 3. Typical Communication With the bq2013H