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000-0046140-111
Page 94 of 169
SLG46140
13.0 Analog Comparators (ACMP)
There are two Analog Comparator (ACMP) macrocells in the SLG46140. In order for the ACMP cells to be used in a GreenPAK
design, the power up signals (ACMPx_pdb) need to be active. By connecting to signals coming from the Connection Matrix, it is
possible to have each ACMP be on always on, always off, or power cycled based on a digital signal coming from the Connection
Matrix. When ACMP is powered down, output is low.
PWR UP = 1 => ACMP is powered up
PWR UP = 0 => ACMP is powered down
During ACMP power up, its output will remain low, and then becomes valid 4.42 ms (max) after ACMP power up signal goes high,
see
. If VDD is greater or equal to 2.7 V, it is possible to decrease turn-on time by setting the BG ok delay to 100
μ
s,
. The ACMP cells have an input "Low bandwidth" signal selection, which can be used to save power and reduce
noise impact when lower bandwidth signals are being compared. To ensure proper chip startup operation, it is recommended to
enable the ACMPs with the POR signal, and not the VDD signal.
Each of the ACMP cells has a positive input signal that can be provided by a variety of external sources. There is also a selectable
gain stage (1X, 0.5X, 0.33X, 0.25X) before connection to the analog comparator. The Gain divider is unbuffered and consists of
250 KΩ (typ.) resistors, see
. For gain divider accuracy refer to
IN- voltage range: 0 - 1.2 V. Can use Vref
selection VDD/4 and VDD/3 to maintain this input range.
Input bias current < 1 nA (typ).
Table 65. Gain Divider Input Resistance (typical)
Gain
x1
x0.5
x0.33
x0.25
Input Resistance
100 GΩ
1 MΩ
0.75 MΩ
1 MΩ
Figure 49. Maximum Power On Delay vs. VDD,
BG = 550 µs, Regulator and Charge Pump set to automat-
ic ON/OFF
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
1.71
1.80
1.89
2.50
2.70
3.00
3.30
3.60
4.20
4.50
5.00
5.50
POWER
ON
DELA
Y (
μ
S
)
VDD (V)
-40⁰C
room
+85⁰C
Figure 50. Maximum Power On Delay vs. VDD,
BG = 100 µs, Regulator and Charge Pump set to automatic
ON/OFF
200
400
600
800
1000
1200
1400
1600
1.71
1.80
1.89
2.50
2.70
3.00
3.30
3.60
4.20
4.50
5.00
5.50
PO
WER
ON
DEL
A
Y (
μ
S
)
VDD (V)
-40⁰C
room
+85⁰C
Содержание GreenPAK SLG46140
Страница 102: ...000 0046140 111 Page 101 of 169 SLG46140 14 1 Initial Polarity Operations Figure 54 DFF Polarity Operations ...
Страница 103: ...000 0046140 111 Page 102 of 169 SLG46140 Figure 55 DFF Polarity Operations with nReset ...
Страница 104: ...000 0046140 111 Page 103 of 169 SLG46140 Figure 56 DFF Polarity Operations with nSet ...