
Analog Integrated Circuit Device Data
Freescale Semiconductor
183
PC34708
Typical Applications
Introduction
8.1.1
Application Diagram
Figure 44. PC34708 Typical Application Schematic
8.1.2
Application Instructions
The PC34708 device is designed to fulfill the voltage requirements for several processors of the Freescale i.MX family. To
achieve such flexibility, it implements a hardware programmable Power-on sequence (PUMS 1-5) to attend to the specific power-
up requirements of each i.MX processor, as explained in the
Power Up section. The following table shows the voltage rails on
the PC34708 matching to the voltage domains on the i.MX53 processor as an example.
BP
RE
SE
T
B
RE
SE
T
B
M
C
U
WD
I
Switchers
GNDADC
ADIN11
MUX
10 Bit GP
ADC
INT
C
L
K
32K
XT
AL
1
XT
AL
2
GN
DRT
C
LICELL
GPIO Control
GP
IO
L
V
1
GP
IO
L
V
2
RTC +
Calibration
GNDSW2
SW2FB
SW2LX
SW1IN
SW2IN
O/P
Drive
`
GNDSW1A
SW1FB
SW3IN
O/P
Drive
GNDSW3
SW3FB
SW3LX
GNDSWBST
SWBSTFB
SWBSTIN
SWBSTLX
O/P
Drive
PW
RO
N
1
PU
M
S
1
Typical Application
Diagram REV0.66
Freescale
Semiconductor
Monitor
Timer
O/P
Drive
PLL
32 KHz
Crystal
Osc
ST
AN
DB
Y
GP
IO
L
V
3
To Interrupt
Section
Die Temp &
Thermal Warning
Detection
LCELL
Switch
Enables &
Control
SPI Result
Registers
Interrupt
Inputs
G
NDC
T
R
L
Core Control Logic, Timers, & Interrupts
32 KHz
Internal
Osc
GP
IO
L
V
4
C
HRGL
E
D
R
Battery Interface &
Protection
LICELL, UID, Die Temp, GPO4
ADIN10
CL
K
3
2
K
M
C
U
GNDREG1
GNDREG2
ADIN9
A/D Result
A/D
Control
ICT
E
S
T
32 KHz
Buffers
Output Pin
Input Pin
Bi-directional Pin
Package Pin Legend
SPI
Interface
+
Muxed
I2C
Optional
Interface
CS
CLK
GNDSPI
MISO
SPI
Registers
MOSI
Shift Register
SPIVCC
To Enables & Control
To
Trimmed
Circuits
SPI
Control
Logic
Trim-In-Package
Startup
Sequencer
Decode
Trim?
PUMSx
Control
Logic
Li Cell
Charger
SW2
LP
1000 mA
Buck
SW3
INT MEM
500 mA
Buck
SWBST
380 mA
Boost
Voltage /
Current
Sensing &
Translation
MC34708
SW4
Dual Phase
DDR
1000 mA
Buck
VSRTC
VS
RT
C
VINREFDDR
VPLL
VPLL
50 mA
Pass
FET
VREFDDR
10mA
VREFDDR
SPI Control
VBUS
VINUSB
VUSB
UID
C
onnector
Inter
fac
e
Best
of
Supply
LIC
E
L
BP
Reference
Generation
VCOREDIG
GNDCORE
VCORE
VCOREREF
VBUS/ID
Detectors, Host
Auto detection
UART Switches
Audio Switches
VUSB
Regulator
SU
BS
AN
A1
SU
BS
PW
R1
SUB
SR
EF
SU
BS
G
N
D
SU
BS
PW
R2
SU
B
SAN
A
3
SU
BS
AN
A2
SU
BS
L
D
O
VINPLL
PUM
S
2
PW
RO
N
2
GL
B
R
S
T
SW5IN
O/P
Drive
GNDSW5
SW5FB
SW5LX
SW5
I/O
1000 mA
Buck
VUSB2
350mA
VDACDRV
VDAC
VUSB2
VUSB2DRV
VDAC
250mA
GNDA
CH
RG
SW1ALX
DVS
CONTROL
Coulomb
Counter
CFP
CFN
BATTISNSCCN
CCOUT
To SPI
CH
RGL
E
D
G
DM
DP
DPLUS
DMINUS
OVP
SPKR
SW1PWGD
SW2PGD
PWM
Outputs
PW
M
1
PW
M
2
SPKL
MIC
RXD
TXD
GNDSW1B
O/P
Drive
SW1BLX
SW4AIN
GNDSW4A
SW4FBA
O/P
Drive
SW4ALX
SW4BIN
GNDSW4B
SW4BFB
O/P
Drive
SW4BLX
GNDUSB
SW4CFG
L
E
DV
DD
VDDLP
VGEN1
250mA
VGEN2DRV
VGEN2
VGEN2
250mA
Pass
FET
VGEN1
Pass
FET
VINGEN1
PUM
S
3
PU
M
S
4
SD
WN
PR
ETM
R
TR
IC
K
L
ES
EL
CHR
GF
B
BA
TTI
S
N
SN
BA
TTI
S
N
SP
BP
CH
RGL
X
VB
USV
IN
AU
XV
IN
GA
U
X
GB
A
T
BP
SN
S
GOT
G
VA
UX
Switching Charger
Interface and Control, Protection,
Trickle Generation
SW1
Dual Phase
GP
2000 mA
Buck
SW1CFG
VALWAYS
SW1VSSSNS
VHALF
BPTHERM
NTCREF
BA
TT
BATTISNSCCP
IT
RIC
PU
M
S
5
GP
IO
V
D
G
NDGP
IO
GNDREF1
GNDREF2
GNDREF
LDOVDD
Pass
FET
100n
Coin Cell
Battery
2.2u
SWBST
100pF
1u
SPI
SW5
10uF
(needs to be separate routes from
BATTISNSP and BATTISNN)
General Purpose ADC Inputs:
i.e., PA thermistor, Light Sensor, Etc.
24K
To battery
Thermistor
To/From
Audio IC
To/From
AP
To/From
USB Cable
100n
BP
R1
20m
10u
Tied to
BATTISNSCC
2.2u
10u
VBUS
(Charger input)
10u
Aux charge input
10u
BP
To GND,
VCOREDIG,
Float
BP
10u
SWBST
Output
(Boost)
2.2u
4.7u
BP
SW4B
1u
BP
2.2u
1.0u
2 x22u
SW1 Output
BP
4.7u
BP
4.7u
1.0u
22u
SW2 Output
To AP
BP
4.7u
1.0u
10u
SW3 Output
1.0u
10u
SW4A Output
BP
4.7u
1.0u
10u
SW4B Output
1.0u
22u
SW5 Output
BP
4.7u
To AP
2.2u
BP
2.2u
BP
SW5
2.2u
BP
2.2u
VCOREDIG
BP
100n
BP
To AP
To Peripherals
To GND, or
VCOREDIG
To/From
AP
On/Off
Button
W
a
keup
fr
om
A
P
Reset
button
32.768 KHz
Crystal
15p
S
W
5
or
S
W
3
10n
GN
DCH
RG
0.1u
100K
10
0K
10
0K
10
0K
1u
ADIN14/TSY1
ADIN15/TSY2
ADIN13/TSX2
TSREF
Touch
Screen
Interface
ADIN12/TSX1
Touch
Screen
Interface
2.2u
100n
10n
1
C1
M3
C2
L1
D9
C69
R73
C3
C67
M2
M1
C68
C4
D1
D2
C54
R11
C53
C56
C50
C51
C52
C49
C47
C46
C5
L2
C6/C7
R18
C10
L4
C11
R19
C13
L5
C14
C16
L6
C17
C22
C20
L7
C23
L8
L9
C25
D3
C26
C57
C55
C28
C30
C29
Q1
Q3
C36
C38
Q5
C41
C43
C45
R20
R4
C44
18p
Y1
R3
C19