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RT5002 датащи(PDF) 29 Page - Richtek Technology Corporation

номер детали RT5002
подробное описание детали  7 1 Channel DC/DC PMU with Li-Ion Battery Charger for DSC
PDF  40 Pages
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производитель  RICHTEK [Richtek Technology Corporation]
домашняя страница  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT5002 датащи(HTML) 29 Page - Richtek Technology Corporation

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RT5002
29
DS5002-00
November 2011
www.richtek.com
Charging Current Decision
The charge current can be set according to the following
equations :
CHG1
ISETA
CHG_FAST
ISETA
CHG2
ISETA
CHG_FAST
ISETA
CHG_PRE
CHG_FAST
If ISET = 1 (for I)
V
I
=
300
R
If ISET = 0 (for I)
V
I
=
150
R
I
= 10%I
×
×
×
Address
b[7]
(MSB)
b[6]
b[5]
b[4]
b[3]
b[2]
b[1]
b[0]
(LSB)
Meaning
TIMER [3:0]
ENCH
JEITA
ISET
VSET
Default
0
1
0
0
0
0
0
0
0x1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
VIN Power Good Status
TIMER [3:0]
0000 to
1111
Fast Charge timeout period : tFCHG = (TIMER [3:0] + 1) hours. (ISET = 1)
Pre-Charge timeout period : tPCHG = tFCHG / 8
1
Disable charger
ENCH
0
Enable charger
1
Charger operation controlled by I
2
C bits VSET and ISET
JEITA
0
Charger operation automatically in JEITA temperature standard
Half Charge Current Set Input
1
For ICHG1 : time = tFCHG
ISET
0
For ICHG2: time = 2 x tFCHG, ICHG2 = ICHG1 / 2
Battery Regulation Set Input
1
Battery regulation voltage is 4.2V
VSET
0
Battery regulation voltage is 4.05V
CHG1
FCHG
CHG2
FCHG
If ISET = 1 (for I)
time = t
If ISET = 0 (for I)
time = 2t
×
Time Fault
During the fast charge phase, several events may increase
the charging time.
For example, the system load current may have activated
the APPM loop which reduces the available charging
current or the device has entered thermal regulation
because the IC junction temperature has exceeded TREG.
However, once the duration exceeds the fault time, the
register 0x2 bit [0] will be changed from 0 to 1, and the
charge current will be reduced to about 1mA.
Time fault release methods :
(1) Re-plug power
(2) Toggle EN
(3) Enter/exit suspend mode
(4) Remove Battery
(5) OVP



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