STV0299B STMicroelectronics, STV0299B Datasheet - Page 20

• Manufacturer Part Number: STV0299B
• Manufacturer: STMicroelectronics

Specifications of STV0299B

• Pin Count: 64
• Screening Level: Commercial
• Lead Free Status / Rohs Status: Specific Sites Compliant

STV0299B
5
20/36
AUXILIARY CLOCK REGISTER (refer to Section 4.1.8 on page 8)
F22 FREQUENCY REGISTER (refer to Section 4.1.8 on page 8)
I
2
CRPT REGISTER (refer To Section 4.1.10 on page 10)
REGISTER LIST (continued)
I
F22FR
2
Name
ACR
CRPT
Address
HEX
03
04
05
Reset
Value
2A
8E
0F
Position
[7:0]
[7:0]
[5:4]
Bit
[6]
[3]
7
2
1
0
ACR Prescaler and Divider
This register is made up of the ACR [7:5] Prescaler field and the ACR
[4:0] Divider field. The values in these fields configure the auxiliary
clock function, the prescalar value, the clock signal frequency.
The frequency range is given for f
The actual frequency is f
accessed, the divider by 16 (also common to AUX_CLK) and the
divider by R[7:0] are initialized.
I
1: I
0: Output port
Must be programmed to zero.
Repeater response time; value does not matter if the external time
constant
Must be programmed to zero.
SCLT Port value
This bit must be programmed to zero.
SDAT Port value
001XXXXX
010XXXXX
011XXXXX
100XXXXX
101XXXXX
110XXXXX
111XXXXX
2
000XXXX0
000XXXX1
In the LF generator, the programmable division factor is
32 + ACR[4:0]. In the HF generator, it is simply ACR[4:0]. This allows
the building of any frequency from 24 Hz to 1.1 kHz (within ±1.5%) in
the full operating range. The output signal is square in all cases.
When the auxiliary register is written, the prescaler and the program-
mable divider are reset.
ACR [7:0]
CT
2
C repeater
250ns.
Function
generator
generator
generator
generator
generator
generator
generator
Output
Output
Port
Port
HF
LF
LF
LF
LF
LF
LF
Prescaler
Signal Description
1024
2048
N/A
N/A
128
256
512
64
1
VCO
/(128 R[7:0]). When this register is
VCO
f
f
f
f
f
VCO
VCO
f
VCO
VCO
VCO
VCO
= 400 MHz.
Signal Frequency
/131072/(32+ACR[4:0])
/262144/(32+ACR[4:0])
f
/16384/(32+ACR[4:0])
/32768/(32+ACR[4:0])
/65536/(32+ACR[4:0])
VCO
/8192/(32+ACR[4:0])
output port = 0
output port = 1
/8/ACR[4:0]
1525 Hz
50 MHz
762 Hz
381 Hz
190 Hz
Range
775 to
388 to
194 to
95 Hz
47 Hz
1.6 to
97 to
49 to
24 to
N/A
N/A