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2001-2011 Microchip Technology Inc. Preliminary DS41157D-page 1
1.0 PROGRAMMING THE HCS370
HCS370 devices are programmed using a serial
method that differs from previous K
EELOQ
®
encoders.
This Serial mode will still allow the HCS370 to be pro-
grammed while in the users system (ICSP™). This
allows for great design flexibility. This programming
specification applies to HCS370 devices in all pack-
ages.
1.1 Hardware Requirements
The HCS370 requires one programmable power sup-
ply for V
DD (4.5V to 5.5V) and a VPP of 9V to 14V. Both
supplies should have a minimum resolution of 0.25V.
FIGURE 1-1: HCS370 DIAGRAM
TABLE 1-1: PROGRAMMING PIN DESCRIPTION
PDIP, SOIC, TSSOP
HCS370
S0
S1
S2
S3
S4
SLEEP
SHIFT
V
DD
LED
OUTPUT
V
SS
RFEN
STEP
V
IN
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Pin Name Function HCS370 Pin Type Pin Description
S0 DATA 1 I/O Data Input Output
S1 CLOCK 2 I Clock Input
LED
VPP 13 P(*) Program mode select
V
SS VSS 11 P
Ground
VDD VDD 14 P
Power supply
Legend: I = Input, O = Output, P = Power
Note: In the HCS370, the programming high voltage is internally generated. To activate the Programming mode,
high voltage needs to be applied to LED
input. This is used as a level source, meaning that LED does not
draw any significant current.
HCS370
HCS370 Programming Specifications
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