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參數(shù)資料
| 型號(hào)： | RE46C180S16TF |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 36/58頁(yè) |
| 文件大?。?/td> | 851K |
| 描述： | IC ION SMOKE DETECT ASIC 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,600 |
| 系列： | * |
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RE46C180
DS22275A-page 36
?2011 Microchip Technology Inc.
4.9
User Lock Bit Programming
Test mode TM19 allows users to program the user
EE lock bit. Once the user EE lock bit is set, the pro-
grammed user EE data can not be changed unless the
lock bit is reset.
To enter this mode, follow these steps:
1. Power up with the bias condition shown in
Figure 4-1 to enter M0. At power-up:
TEST = IO = FEED = T2 = V
SS
,
DETECT = V
DD
.
2. Drive T2 input from V
SS
to V
DD
and hold at V
DD
to enter TM0.
3. Drive TEST from V
SS
to V
DD
and hold at V
DD
.
4. Apply 19 clock pulses to the T2 input (V
DD
to
V
SS
and then back to V
DD
) to enter in TM19
mode.
5. Hold TEST at V
DD
and pulse IO once to set the
lock bit and store into the EEPROM memory.
6. To reset the lock bit from Step 5, drive TEST to
V
SS
and pulse IO once.
FIGURE 4-9:
Timing Diagram for User Lock Bit Programming in Mode TM19
rEE l k i
VDD
TEST
VSS
VDD
T2
VSS
Min TSETUP1 = 1
in TPW1 = 1
Min T1 = 20 祍
Min PW2 = 10 ms
VDD
IO
VSS
MODE
M0
TM0
TM1
TM2
TM3
TM4
TM5
TM6
M1
TM19
To reset user EE lock bit
VDD
TEST
VSS
VDD
T2
VSS
Min TSETUP1 = 1
in TPW1 = 1
Min T1 = 20 祍
Min PW2 = 10 ms
VDD
IO
VSS
MODE
M0
TM0
TM1
TM2
TM3
TM4
TM5
TM6
M1
TM19
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