U6207B
I
2
C Bus Description
Data Formats
Description
Address byte
Progr. divider byte 1
Progr. divider byte 2
Control byte 1
Control byte 2
MSB
1
0
n7
1
SW7
1
n14
n6
5I
X
0
n13
n5
T1
X
0
n12
n4
T0
X
Data Format
0
n11
n3
X
X
AS1
n10
n2
X
SW2
AS2
n9
n1
PSC
SW1
LSB
0
n8
n0
OS
X
A
A
A
A
A
A = Acknowledge; X = not used; Unused bits of controlbyte 2 should be 0 for lowest power consumption.
n0 ... n14:
PSC
T0, T1
Scaling factor (SF)
Prescaler on/off
Testmode selection
SW 1, 2, 7
5I
OS
Switching outputs
Charge pump current switch
Output switch
SF = 16384*n14 + 8192*n13 + ... +2*n1 + n0
PSC = 1: prescaler on (PSF = 8)
PSC = 0: prescaler off (PSF = 1)
T1 = 1: divider test mode on
T1 = 0: divider test mode off
T0 = 1: charge pump disable
T0 = 0: charge pump enable
SW1, SW2, SW7 = 1: open collector active
5I = 1: high current
5I = 0: low current
OS = 1: varicap drive disable
OS = 0: varicap drive enable
AS1, AS2
Address selection pin 7
AS1
0
0
1
1
AS2
1
0
0
1
Address
1
2
3
4
Dec. Value
194
192
196
198
Voltage at pin7
open
0 to 10% Vs
40 to 60% Vs
90 to 100% Vs
Oscillator Frequency Calculation
f
osc
= f
ref
* SF * PSF
f
osc
Locked oscillator frequency
Reference frequency 4 MHz / 512 = 7.8125 kHz
f
ref
SF
Scaling factor of programmable 15-bit-divider
PSF Scaling factor of prescaler
4 (8)
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
TEMIC [ TEMIC SEMICONDUCTORS ]
