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参数资料
| 型号： | TDA4854/V2 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 偏转 |
| 英文描述： | HORIZ/VERT DEFLECTION IC, PDIP32 |
| 封装： | PLASTIC, SDIP-32 |
| 文件页数： | 32/63页 |
| 文件大小： | 318K |
| 代理商： | TDA4854/V2 |
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1999 Jul 13
38
Philips Semiconductors
Product specication
I2C-bus autosync deection controllers for
PC/TV monitors
TDA4853; TDA4854
Protection and standby mode
Soft-down sequence:
Start the sequence by setting control bit SOFTST = 0
BDRV duty cycle decreases
HDRV duty cycle decreases.
Protection mode:
Pins HDRV and BDRV are floating
Continuous blanking at pin CLBL is active
Pin HUNLOCK is floating
PLL1 and PLL2 are disabled
Register contents are kept in internal memory.
Protection mode can be left by 3 ways:
1. Entering standby mode by setting control
bit SOFTST = 0 and control bit STDBY = 1
2. Starting the soft-start sequence by setting control
bit SOFTST = 1 (bit STDBY = don’t care);
see L3 of Fig.20 for continuation
3. Decreasing the supply voltage below 8.1 V.
Standby mode:
Set control bit STDBY = 1
Driver outputs are floating (same as protection mode)
Supply current is 9 mA
Only the I2C-bus and protection circuits are operative
Contents of all registers except the value of bit STDBY
and bit SOFTST are lost
See L2 of Fig.20 for continuation.
MBK382
Standby mode (XXXX XX01)
STDBY = 1
SOFTST = 0
all other register contents are random
Soft-down sequence (XXXX XX00)
STDBY = 0
SOFTST = 0
L4
L3 (1)
no
yes
SOFTST = 1?
yes
L2 (1)
Protection mode (XXXX XX00)
STDBY = 0
SOFTST = 0
registers are set
no
STDBY = 1?
S
8CH
A
0DH
A
00H
A P
S
8CH
A
0DH
A
01H
A P
Fig.21 I2C-bus flow for protection and standby
mode.
(1) See Fig.20.
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