PATENTED
Name
ID
Command Code
D/C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
Function
HT1626
Def.
EXT (XTAL) 32K
1 0 0
0001-11XX-X
TONE 4K
TONE 2K
IRQ DIS
IRQ EN
F1
F2
F4
F8
F16
F32
F64
F128
TEST
NORMAL
Note:
1 0 0
010X-XXXX-X
1 0 0
0110-XXXX-X
1 0 0
100X-0XXX-X
1 0 0
100X-1XXX-X
1 0 0
101X-0000-X
1 0 0
101X-0001-X
1 0 0
101X-0010-X
1 0 0
101X-0011-X
1 0 0
101X-0100-X
1 0 0
101X-0101-X
1 0 0
101X-0110-X
1 0 0
101X-0111-X
1 0 0
1110-0000-X
1 0 0
1110-0011-X
System clock source, external 32kHz
c lo c k s ou r c e or cr y st a l o sci l l at o r
32.768kHz
Tone frequency output: 4kHz
Tone frequency output: 2kHz
Disable IRQ output
Enable IRQ output
Time base clock output: 1Hz
The WDT time-out flag after: 4s
Time base clock output: 2Hz
The WDT time-out flag after: 2s
Time base clock output: 4Hz
The WDT time-out flag after: 1s
Time base clock output: 8Hz
The WDT time-out flag after: 1/2s
Time base clock output: 16Hz
The WDT time-out flag after: 1/4s
Time base clock output: 32Hz
The WDT time-out flag after: 1/8s
Time base clock output: 64Hz
The WDT time-out flag after: 1/16s
Time base clock output: 128Hz
The WDT time-out flag after: 1/32s
Test mode, user don¢t use.
Normal mode
Yes
Yes
Yes
X : Don¢t care
A7~A0 : RAM address
D3~D0 : RAM data
D/C : Data/Command mode
Def. : Power on reset default
All the bold forms, namely
1 1 0, 1 0 1,
and
1 0 0,
are mode commands. Of these,
1 0 0
indicates the command
mode ID. If successive commands have been issued, the command mode ID except for the first command will
be omitted. The source of the tone frequency and of the time base or WDT clock frequency can be derived from
an on-chip 32kHz RC oscillator, a 32.768kHz crystal oscillator, or an external 32kHz clock. Calculation of the
frequency is based on the system frequency sources as stated above. It is recommended that the host control-
ler should initialize the HT1626 after power on reset, for power on reset may fail, which in turn leads to the mal-
functioning of the HT1626.
Rev. 1.60
13
November 9, 2010
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
