[AK1541]
4. Pin Functional Description
Table 1 Pin Function
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Note 1)
Note 2)
Name
CPVDD
TEST4
TEST1
LE
DATA
CLK
LD
PDN2
PDN1
REFIN
TEST2
TEST3
VREF1
DVSS
VREF2
RFINN
RFINP
PVDD
BIAS
PVSS
CP
CPZ
SWIN
CPVSS
I/O
P
DI
DI
DI
DI
DI
DO
DI
DI
AI
DI
DI
AIO
G
AIO
AI
AI
P
AIO
G
AO
AIO
AI
G
Pin Functions
Power supply for charge pump
Test pin 4
Test pin 1
Load enable
Serial data input
Serial clock
Lock detect
Power down pin for PLL
Power down signal for LDO
Reference input
Test pin 2
Test pin 3
Connect to LDO reference voltage capacitor
Digital ground pin
Connect to LDO reference voltage capacitor
Prescaler input
Prescaler input
Power supply for peripherals
Resistance pin for setting charge pump output
current
Ground pin for peripherals
Charge pump output
Connect to the loop filter capacitor
Connect to resistance pin for fast lockup
Ground pin for charge pump
“Hi-Z”
Notes 1) & 2)
Notes 1) & 2)
“Low”
“Low”
Internal pull-down,
Schmidt trigger input
Internal pull-down,
Schmidt trigger input
“Low”
Schmidt trigger input
Schmidt trigger input
Internal pull-down,
Schmidt trigger input
Internal pull-down,
Schmidt trigger input
Schmidt trigger input
Schmidt trigger input
Schmidt trigger input
Power down
Remarks
For detailed functional descriptions, see the section “Charge Pump and Loop Filter” in “8. Block Functional
Description” below.
The input voltage from the [CPZ] pin is used in the internal circuit. The [CPZ] pin must not be open even
when the fast lockup feature is unused. For the output destination from the [CPZ] pin, see “P.12
Fig.5 Loop
MS1043-E-05
4
2013/03
AKM [ ASAHI KASEI MICROSYSTEMS ]
