HT46R74D-1 Holtek Semiconductor, HT46R74D-1 Datasheet - Page 25

• Manufacturer Part Number: HT46R74D-1
• Description: Dual Slope A/D Type MCU
• Manufacturer: Holtek Semiconductor

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state and store the time taken, Tc, which is the de-inte-
grating time. The following formula 1 can then be used
to calculate the input voltage V
formula 1: V
Rev. 1.10
Bit No.
1~2
4~5
0
3
6
7
ADDISCH0~
ADDISCH1
(Based on ADRR0=0)
ADPWREN
ADINTM0~
ADINTM1
ADCCKEN
ADCMPO
A
ADRR0
= (1/3) VDSO (2 Tc/Ti).
Label
Dual slope block (including input OP) power on/off switch.
0: disable Power
1: Power source comes from the regulator.
Defines the ADC discharge/charge.
00: reserved
01: charging - Integrator input connect to buffer output
10: discharging - Integrator input connect to VDSO)
11: reserved
Dual Slope ADC - last stage comparator output.
Read only bit, write data instructions will be ignored.
During the discharging state, when the integrator output is less than the reference voltage,
the ADCMPO will change from high to low.
ADC integrator interrupt mode definition. These two bits define the ADCMPO data interrupt
trigger mode:
00: no interrupt
01: rising edge
10: falling edge
11: both edge
ADC OP chopper clock source on/off switch.
0: disable
1: enable (clock value is defined by ADCD register)
ADC resistor selection
0: (V
1: (V
INT
INT
A
.
, V
, V
CMP
CMP
)= (4/6 VOREG, 1/6 VOREG)
)= (4.4/6 VOREG, 1/6 VOREG)
ADCR (18H) Register
25
In user applications, it is required to choose the correct
value of R
the V
1/6VDSO. Vfull cannot be greater than 5/6VDSO and
Vzero cannot be less than 1/6VDSO
Function
C
value to operate between 5/6VDSO and
DS
and C
DS
to determine the Ti value, to allow
HT46R74D-1
January 11, 2007